Boss reactions against unreachable attackers?

[Falcaram]

I would like to know what happens when someone hits a boss from a place the boss can't actually reach, no matter the route he takes (an "Evade" position) . Does it react like a normal mob and start evading? Or does it just eat the hits?

If there's more reachable people, does he just drop the aggro on that target and go for another one?

[ChrisC]

He would evade reset if you pull agro.