Question, For EA Sports UFC 5...

Hi, EA Sports UFC 5 .
Sorry for my English... I'm from France and I don't speak English... I use an online translator... For example... I put myself in a submission position and wait for my opponent to move... He goes to the right and I block him to the right... But they still manage to escape, Why ?...
I come from, France... Thanks you, EA Sports UFC 5.