Eye for an Eye is absolutely mitigation. It's just preemptive, not reactive. It triggers on physical hits (at a % chance) to reduce all outgoing damage from the mob who procs it by 10%. If it luckily procs properly, that's an additional Storm's Path on whatever attacks happen while the 20s duration debuff lasts. And it can proc multiple times while it's active on you.

You can't use it directly to mitigate a buster, but if you properly preempt it by popping it ~20s before the buster hits, it'll work really well.