His language was plain as you might expect of a man who would never again subject himself to the blazered scrutiny of strangers. Removing his vest in the ring, he'd looped around, raising the middle figure of both hands to those who had just declared him beaten by Russia's Vladimir Nikitin.
It was maybe the least eloquent work he had summoned on this Brazilian morning but, to the untrained eye at least, he could be forgiven an inelegant farewell. Concern about the probity of Olympic judging had been raised before these Games began and, if that concern emboldened the odd opportunistic cry of something being amiss in recent days, the sound building last night was beginning to turn heads.
Memories of Olympic boxing's most infamous decision, the scandalous verdict given to local boxer Park Si-Hun over Roy Jones Jnr at Seoul in '88, were invoked on Monday as a Russian heavyweight was declared victor over a Kazakh who had all but handed him his teeth in a jar.
If the adjudication of Conlan's fight didn't quite sink to that kind of incongruous depth, it did look questionable.
True, the Belfast boxer lost previously to Nikitin at the 2013 World Championships, but that had been his debut outing as a bantamweight. Since then, he's grown into the division sufficiently to hold the World, European and Commonwealth crowns.
"I'm absolutely devastated," said Conlan, having declared the judges "cheating bast**ds" on live TV and the governing AIBA "corrupt". As he spoke to media, his father and coach John could not help but interject. "Shame on them, shame on them" he repeated twice.
Remarkably, all three judges had declared Nikitin winner of a first round in which Conlan looked largely in control. In fact, grumbles were audible in the auditorium as that score was conveyed to the public, a quick glance out towards where Paddy Barnes sat confirming for Conlan the bad news brewing.
Having then levelled the fight by dominating the second in a way that brooked no argument, the degeneration of the third into a clumsy toe-to-toe scrap left Conlan vulnerable.
"That was terrible," declared head coach Zaur Antia, the Georgian now cursed to a solemn homecoming, his team the first since Athens in '04 to return without a medal.
"He won first round very clean, but (Nikitin leading) three nil? How is this possible?" asked Antia. "The second round was close and Michael gets three nil. They kept the last round for the Russian, that's what they did. They need to change things because it's no good when they do not give the correct decision."
Antia, enraged by the split decision that ended Katie Taylor's Olympics on Monday, suggested that disquiet with the judges was broadening and there were rumours within the media centre last night of officials from Ireland, Britain, Canada and the US perhaps formalising some form of protest.
None of that mattered a hill of beans to Conlan though, his future now almost certainly- with brother Jamie in the professional ranks.
That said, the very concept of 'amateur boxing' has been essentially redundant for some time with the creation of the APB and WSB series of boxing in which men like Conlan are paid to box for international franchises.
"My Olympic dream was robbed from me today," he said.
Asked if he had arrived at Riocentro Six with any concern that it might be, he was unequivocal. "No, not at all. I watched the heavyweight fight last night and, after what happened to Katie, (I thought) 'this can't happen to me'. For a whole nation to be watching with their whole press and media, they couldn't go and rob me could they? But, in fact, they did.
"We've seen the Russian's reaction after. He didn't believe he won, I didn't believe he won, the crowd didn't believe he won, I don't even think his corner believed he won. And he reacted like he had won an Olympic gold medal.
"Today I wouldn't even have celebrated. I was here for gold. My Olympic dream has been ruined. One thing's for sure, I'll not box in an AIBA competition again. Even if they offered me five million to box in the APB... because I feel they are probably one of the most corrupt organisations in the world." A mournful prayer for amateur boxing then?
"It's completely dead," he rasped. "You've seen some of the decisions, Olympic boxing is dead."
Standing stone-faced behind him, John Conlan's composure was now a trembling candle. This has been an Olympics from hell for the Irish coaches, but Conlan's sense of loss for his son had become the compelling energy.
"What do you lads think?" he asked the assembled journalists. "You're asking questions and drawing things out that will make you the headline story.
"Tell the truth, say what it is, you don't need us to put words in your mouths.
"You guys all went to university, we didn't. Yiz have all spent four or five years to become f***ing writers or whatever, well then do your job, tell the truth," he added.
His son agreed with a suggestion that other Irish boxers would now question the "worth" of chasing Olympic gold.
"I'd say so," said Conlan. "Some of the boys should have got to the medal stages. I'm absolutely devastated. I brought my family out, I paid their way. It's horrible, it's sad.
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