I have gotten shocked with 110 220 480 600, and yep, I've gotten that grip, broke my Klein needle nose pliers, just made them snap from the handle.
one my dad switched on a breaker that he thought wasn't connected to the outlet I was working on, and I got buzzed. I mean I was hooked on the ground and on the hot wire at the same time and all I could do was clench my teeth so I wouldn't bite off my tounge and clench my chest. Why not try letting go? I couldn't, my hands were gripped, I did manage to kick the wall and my dad knew what had happened and kicked off the breaker. Yea this laste for 10 secs but it seemed like 5mins when you're on the recieving end, lol.
Another time I got hit with 220 from the city's incoming line to this lady's electric meter. It was hot, I was wearing a chrome watch, sweat dripped off it and made the weather stripped insulation short me in, and my other hand opened up making me drop my wire cutters and arm swuing out towards the other bare line that was halfway cut and got me the double buzz, and knocked me off my ladder and landed on the ground.
Bad thing it was 2floor home, good thing the ground was soft grass. the bad thing, I left an impression of my body there

It was done in an instat but knew what happened when I felt my watch hot and my other hand had an electrical burn.