Howard the Duck evade in arena

Just fought a Howard the duck in arena with abomination. Howard did 3 green evades right before abomination kod him with thunderquack on. Read thru Howards info and saw no mention of evade. Only thing I can see is the bonus effect after a sp3 maybe. Idk.
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When he does sp3 he gains a buff based on class on opponent
Against science he gets evade
Against mutants he gets regen
Against mystic he gains a chance to nullify and i think a power gain buff
Forgotten the rest