http://forums.elderscrollsonline.com/discussion/comment/537641#Comment_537641
There's a bug where all of a sudden my character stops swinging or can't cast any spells but I will be killed but can also avoid being killed, I can roll out of the way and avoid the red circles on the ground or if I stay in them I'll take the extra damage, I can run away and the mobs will chase me.
/reloadui fixes the problem but I can't always depend on /reloadui and I will probably be dead when I get back, does Zenimax know anything about this bug?
I tested many different things to see if it was lag such as a healing potion which heals me instantly, when I died from the bug I am able to instantly release to dead without a second of lag, when I resurrect I am able to resurrect instantly with not a second of lag, same with soul gem resurrecting, instant resurrect.
I have encountered this bug quite a few times and twice I was able to run away from the mob until I got out of combat but the rest I died because they put slows on me and I couldn't get out of combat.
Also if it were somehow lag after all of these other things not being effected at all by lag, could /reloadui somehow wipe away the lag and allow me to start fighting again? /reloadui also works instantly and takes a few seconds to load and I'm back to normal.