Separated Rib sucks! Better to take a rest and cross train or drill technique that doesn't cause pain. If you re-aggravate the problem, it has a higher potential to be worse than when it initially started, and if you keep re-aggravating it, it can be a lifelong problem. You don't want to have this plaguing you into your teens and 20's, 30's where you're in your prime and kicking @$$ master's division grappling tournies and UFC do you?