This is something what I sometimes would do. As you go along in the dream, and something happens, like say something was going to bite you, or hurt someone, but you didn't want it to do that, make a thought to yourself, and have that thought change what it was going to do.

Do you get what I mean? Sometimes, I would do that when I was in that situation. Like in nightmares, when I was really scared, for some odd reason, I would slow the time down so the monster couldn't actually get to me in time. I was still non-lucid, but it was my thoughts that could change the course of the dream.