Seeing more and more Mace Windu?

I don't see him in arena, but in GW regularly. I can have one toon at 10% health, another at 5% health, a third with expose, a forth at 1% health and my fifth be Lando with the 2x crit chance buff and the enemy mace without fail will hit Lando. Even if Lando has no turn meter. I've been playing about 3 1/2 months and this still happens.