Huh. If he actually got distracted by his companion/subordinate's death (enough to get a clean shot in) maybe he wasn't as inhuman as he pretended to be.
@Deathhappens nah he was just dependent, he alrdy gave up winning this fight alone and needed her help. She died and so his chance to live through, surprised he was, in more than one way.
@0DvGate Himmel does chop the little demon girl's arm in a flash when she takes a hostage in a previous chapter. Safe to say he was probably what you'd expect of those other fantasy manga heroes MC power level
It was again the author showing a lot in a single, simple panel and letting the viewer extrapolate from it, which I like.