City of Derry, the leaders of Division 2B, may have defeated bottom of the table Seapoint 29-0 but that was not a fair reflection of the game at Judge's Road.
Director of Rugby Moss Dineen said: "We were outplayed for most of the encounter and if it hadn't been for our exceptional defence, the result could well have been different.
"We took our chances when they came but Seapoint did not play like a team that has failed to win a game all season.
"They put everything into their game and it was only two excellent tries in the closing minutes that gave us the bonus point."
The victory has increased Derry's lead over second-placed Highfield to 11, but the Cork team have a game in hand.
Derry kicked off the scoring with a Stephen Corr try after seven minutes, which was converted by Neil Burns, and Ian Bratton side-stepped his way over on the half-time whistle.
In the second-half, the Leinster team were still in the contest but Burns kicked a penalty and, in the dying minutes, David Graham scored two tries to give Derry the win.
Graham got his first when he broke out from his own '22' and crashed through three tackles to go under the posts.
The final try of the game came minutes later. Winger Graham went over in the corner following a penalty into the corner and a line-out. Burns kicked three conversions and that penalty.
Elsewhere in 2B, Dungannon missed a host of chances, even after Bective were reduced to 13 men, in their 7-3 defeat while a late Armagh try gave them a bonus point in a 16-14 win over Sunday's Well. Rainey's game at Highfield was postponed.
In 2A, Banbridge have opened up a six-point advantage at the top over Malone after a 20-18 win at Cashel. Malone lost to Queen's for the second time in the competition as they went down 31-25.