I know you can submit a guy from anywhere
If on the other hand, i misunderstood you, and he was on top of you
I was saying if he meant he was the one on the bottom(not uncommon for a beginner) then he needed to worry more about getting out than submitting the other guy.
Sorry if i wasn't clear
"Remember when you are resting, someone somewhere is training, and when you meet him, he will win."