Evasion 100% disabled in arena?

[Goreshade]

Does evade simply not work, at all, in Arena?

 

As a Sin, i understand that the 50% in stealth evade I get in PvE doesn't transfer over to arena.

 

This is a separate issue however - F1T2 Shadow dash says "99% evade for 1 attack on failed stealth". I've -never- seen this work. I've done it over 10 times at this point, so I'm fairly sure I'm not suffering from that 1% slipping through. 

 

Does anyone know for sure how evade currently works in Arena?