Why can dva remech still one shot?

I see you! :face_with_symbols_over_mouth:

She does have a very extensive kit. However, she is very vulnerable after she demechs. Thats her biggest weakness. I cant tell you how many Reins, Zaryas, Maugas, Hampters, Reapers, Tracers and enemy D.Vas have killed me immediately after I demech.