If you see Emma regain health during a fight, and she was not leashed (a leash is when you run out of a room, or someone does, that she has aggro on) then you should report this in our bug section. Try to remember any steps that you can to re-produce the issue.
Emma does not have a life steal / regen mechanic in her fight and anything resulting in her doing that is either due to her resetting or a bug.
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