Sorry, I misread it as he sort of fainted for two seconds, as he fell over.1: It was in the span of two seconds, as stated in the post.
2. He didn't go unconscious. Minor Eldritch Constructs are built using methods that don't conform those of our universe. Felix witnessed the finished product of those methods, and had his mind warped a fair bit. Had he not looked away, he would have gone insane.