Depending on where you are cleaving, it is sometimes easier to HP and then run back to the Pyre.
I aggroed some repops just near the end of a pull and had a Pyre sat waiting. Would have taken me forever to kill them without mass shield block TP as I only had my dagger with me. So I just converted > died > ran back out and the pyre was still there and useable.
Granted I was fortunate as I was very near the Rala zoneline.