No weaponry besides a small pocket knife each, What are your plans and tactics? Plus Rick still has both hands.
I would mess Rick up. I haven't seen him go in h2h against any one that was good minus Shane and Shane was beating him up.
I'd get as close as I could before throwing the knife at his inner leg. Nail him, then fling a fist full of dirt in his fact. Follow that up with a Spinning hook kick and drop him. Finish him with his knife and go home.