Hmmm... that's interesting. The target will have to walk precisely underneath the person with his yoyo... and what if the yoyo guy misses? I bet he can't just jump off and run... His chosen victim could have a bow or blowpipe to shoot him with and I think he'll have a hard time dodging while on the tree. Worse... the target calls for help and a whole bunch of angry men surrounds the tree and shoot the yoyo guy.
Hey, doesn't that sound like paintball -- someone climbs up a tree to snipe on the opponent team and gets discovered. *splat splat splat splat splat*