Genzin  occasionally refuses to use his A3 when playing multi Battle on auto

on lvl 25 fireknight  wave 1

There are 2 skiin walkers with unkillable capability that  frequently  get my multiplay stuck

it happens despite making the A3 ..fated vengeance..the priority.

wierdly never seem a problem when just starting Single auto battle or manual iand the skill Works fine if manually pressing. It just seems he refuses to us the skill sometimes and just A12 indefinitely