If Ermac wants to bait wakeup attacks he can use this: combo starter, TKS j.K~TP, j.K~TP and here's where fun begins, because the opp is closer than after b2b1 ender, plus double j.K~TP does more damage, so we're not sacrificing anything. From here you can wait for Wakeup, throw them if they just stand up immediately, u4 if they decide to lay down (or d3 to force them to crouch block from lying down); if they try to tech roll, j.P will perfectly stuff them, and it will jump over some WA (of course not KL's spin etc). It is a little forgotten, much better option than b2b1.