Whether he blinked or not, he still should have remembered the guy was still there. He didn't even look for him after grabbing Raya. He should have at least put him in some elaborate and moderately escapable death trap before dismissing him as a threat and continuing with the final phases of his plans.
Its not so much a blink as he was Shadow Stepping I guess in the heat of battle he could have turned to look for Reed after dealing with Sam, and that was harder to illustrate, but even as a powerful wizard, he is still fighting 3on1 and that wouldnt even be so easy unless you were say a fighter or rogue with more combat experience?
Well you still have to give them that edge, to love them or hate them, cause if not its just... meh, and you dont care, and thats no good story writing! At least hes a lot more hard core than last time around ~_~
ahhh a BFD with guarentees to shoot various flavours of elemental magic at the guy with the MSS....that is medium sized sword..However, Methinks its above or equal to him rasing it above his head and shouting "by the power of greyskull!"