Jeremiah calls on his half-spirit nature, and bleeds essence into Kevin. As each blood drop falls, Kevin feels a powerful surge of regeneration passing through him, as his flesh knits back together at an almost terrible pace. It's painful, bitterly, bitterly painful, but slowly it passes. There's still deep, raked wounds on his chest, but the rest of them are gone. He is alive, at the very least.
His breathing eases.
There is no great flash of light or announcement. Jeremiah feels torn and drained afterwards, but that is all.
Kevin heals 5 aggravated damage. Jeremiah's essence is down to 1.