Arm wrestling
Roselyn wasn't pleased with the way Jonathan talked and was utterly shocked at his assumption that she won't be able to take him if he uses his full force, she is a boxer! Do you know how many tries she got broken fingers and got up again to punch someone? Many many times, what will be different about Jonathan? Yes he is a bit muscular, too muscular actually and can take five men by himself with his bare hands, but she can take him if she tried hard enough.
"Excuse me? I am strong! I can beat you with no problems." Roselyn claimed, slamming her hand against the table, demanding that Jonathan takes this match seriously, which she found out to be an arm wrestle since he was cracking his fingers and getting ready for the match, that's about to unfold, in front of Koi's uncaring eyes and Lyn's invisible popcorn.