He apparently runs out first and all the sudden out comes his shield gun and he runs behind a small pillar for cover (and I can hear him cussing behind me about no more ammo)
I switch to the ERDW and secondary fire with my last two rounds thru the pillar and kill him, followed a by a loud (Sonnova B@tch) from behind me

he jumped about a mile cause he thought he was safe and was instantly a skeleton.