Is AUTHOR wrong in the post ? POST : A week ago, the group I've been working with had to present the work we've done to a superior. It was bad, had minor details missing here and there, and it led to a major buildup of anger. 

At one point, it was apparent that one part of the presentation was missing. Everybody looked at me because it was the part I had to work on. God knows how my already angry superior might be feeling at that time, and that was all I could think of.

Nobody knew that my part was left out of the presentation with an exception of one person, who did not inform me earlier about this matter, which, if he did earlier, I would most definitely work on solving this technical difficulty myself. Out of shock, I spoke out stating that nobody informed me about this and that I thought the person in charge had everything settled.

Little did I know, that statement had hurt my colleague, BAD. My guess is he's been feeling shit already from the hurtful comments and all the yelling from our superior. I had to apologise countless times as he went on about how I could have asked earlier, and how I could have done it myself instead. Well, I didn't ask or do it myself because since he volunteered to take up the task to get it done for everyone, why would I have to check or ask or anything like that? Since nobody said anything, I assumed everything is done. So i guess now it is on me to check if his task is done right?

This incident has created a barrier between him and I, and I think it's gonna stay this way for a long time. I hate these type of tensions and I'm always avoiding it, and I really don't know why it keeps happening to me.

I'm honestly just lost here. AITA?