NTW not stunning on evade consistently

I was in war yesterday and wanted to try out my freshly ranked up Negasonic Teenage Warhead on a node 16 in AW. The entire fight her kit was working as designed until he counter attacked me I evaded but he was not stunned and he threw a sp1 while I was dashing in. None of the nodes prevent stun just trying to figure out why I have this AW death for no reason. Anyone else having this issue with NTW?