That sounds like a fun glitch, would be interesting if it can be duplicated again under those same circumstances.
Only thing close like that, that happened to me, was when I had my shield with the perk where if you block as a power attack lands, you go in slow mo, however, as I was in slow mo, i used my shield bash to finish off the attacker,pand was left in slow mo. I couldn't get it to stop. So I moved a distance away from the dead enemy and was still in slow mo, only when I moved back near him did it go away.
