been there done that......
Take him down....go for a sub.
keep your hands up and if you end up on your back, tie him up....if you cant keep ahold of him, use your knees and feet to push him back, and retry for a better position....
if you are gonna do what I do, and refuse to strike, remember to stay relaxed....especially when he isnt gassed and is trying to knock your block off....if you tense up, youre gonna really get hurt pal. Dont assume just because he knows nothing that he isnt dangerous....
I am 5'6, 150 lbs, and the dude I went up against was around 6'3, 200, 210. I suck at takedowns, but even still Ive done alright against people relatively my size....his legs were long and he was tough to take down...often I got him down but I ended up on bottom in a scramble, and had to work my gaurd.
This kid would like to do it again....Ive been thinking about it...but this time around, I get to strike too....I took too many hits last time.