Just so you know, there is not really risks for Wanted players. Cause there is tricks.
If you see you'll lose, just restart the game, that'll don't count as a lost fight, so no coins penalty.
If you already have zero coins, no need to care about challenge, if they win, they'll gain zero coins lol
If you can't challenge a red player cause he's in a party, no prolem, make a party too, and click on the leader of the party which have wanted player(s).
A wanted player will lose his red name after 3 fights, results are irrelevant.