Players have done it, but it takes a bit of luck and perfect maneuvering. They need to be done in a certain order and a certain combination of teleport and run. I don't know the order it's done in. Perhaps somebody else could explain, or you might find the answer on Wizard101 Central.
It is impossible to get to malistare's lair alone.the crystals reset within 20 seconds or so.Just today I beat malistare for the second time although I didn't get a robe. Michael Sprite Shard lvl 50 Grandmaster Master Of Fire