Things were really complicated for Collum's side. There were so many controversial decisions to discuss. But, I should note that lack of replays results in a lower level of report quality.
Collum seem to be quite self-confident. He managed game well with some problems. It was a penalty for Kiwis when Adam Thomas was clipped by a defender inside the Cameroon penalty area in Min 22. Collum missed it. Penalty for Cameroon was quite obvious, YC to goal keeper was also correct, because the ball was moved far away from contact. There were some handballs where referee also missed. Min 76 was another controversial minute. When M.Bondi was on the ground, Collum correctly ignored the contact and showed him a YC for dive-in. In min 94, there was a very tight offside, AR has correctly flaged it . By the way, one should teach these guys how to throw-in properly.
Collum is in my list for 2nd group stage, and maybe a QF-SF for this tournament. He had a decent game and showed his style that I liked very much.