At times when watching the battle on streams I've wondered that question myself! Or at least "that was very close to being impossible... could it come even closer?" I guess it can become thoroughly impossible!
Right now it's interval based, and while I
think it's never impossible on Normal, since Hard and Arcade shifts the timings slightly it might happen there.
In the back of my head I've been thinking about how to solve this, and I think tying new blizzards to animation callbacks when he starts doing his ice tremors should work things out. That is, new winds only and always come just when the spikes melt away so you can move.
I'll add it to my ToDo to fix some safeguard against this kind of douchebaggery!
Also does anyone else not get items against the Sentry Boss? Is that a bug or intended.
That was a bug! It should be fixed in the next patch!