O'Connor was awarded a score of 66.25 for his first run of the heat, placing him eighth in the rankings when the rest of the field had completed theirs.
And with his next effort, the 16-year-old did even better, earning a mark of 71.50 that was the fourth best-scoring second run of any rider.
He came eighth overall, with fourth to ninth qualifying for the semis.
COMMENT RULES: Comments that are judged to be defamatory, abusive or in bad taste are not acceptable and contributors who consistently fall below certain criteria will be permanently blacklisted. The moderator will not enter into debate with individual contributors and the moderator’s decision is final. It is Belfast Telegraph policy to close comments on court cases, tribunals and active legal investigations. We may also close comments on articles which are being targeted for abuse. Problems with commenting? email@example.com