Tbh if McAuley didn't make his move, Robson-Kanu would have scored anyway
Defensive organization was bad and he was partially at fault regardless. McAuley should have reacted faster to Ramsey's pass to Bale to move further back so he wouldn't have to lunge at the last second to reach the cross. Right back should have been closer to Bale as his presence in the middle was completely unnecessary.