Interesting situation-- sorry you died! One thing that might have helped is using your Harmshield and/or Quivering Veil (I usually have HS on my spell bar, but I'm admittedly pretty cautious). This would at least let the casters dump some/much of their mana whilst you're invulnerable.
Otherwise, depending on location and your movement speed, getting around a corner will force the casters to have to move/"chase" you (line of sight), creating a small gap wherein you might be able to get a FD cast off.
As for the OT hammer, funny enough, I've seen someone escape death down in HS with like 4% health with an OT hammer proc
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