The attack is supposed to copy a supporter in play, but it never triggers.
Triage Agent: Fixed. Magby TRR 24’s Detour had no effect implemented. It now uses the effect of the Supporter card you have in play, like Jirachi RR 7’s Detour. Per the PUI Rules Team ruling (Dec 15, 2005), the Supporter’s own requirements still apply (for example Professor Birch with 6 cards in hand): if they aren’t met, the effect fails but the attack is still used. Detour can’t be chosen without a Supporter in play.
Note: only formats with pre-Black & White rules (EX, DP, …) keep the Supporter in play until the end of the turn. Unlimited plays with Black & White rules, where the Supporter is discarded right after use, so there is no Supporter in play to copy there.
The fix goes live with the next deploy.