I may have been overestimating the rate at which the platform is descending, actually.  It's supposed to be moving at 10 feet per round, and I think 2 rounds have elapsed.  (1 round to disable the turret, 1 round to analyze the runes on the machine and fight the skeletons)  So it would likely be about 20 feet down when Cathy charged, and a vertical charge is perfectly fair (and awesome) in my book.  I doubt the rex will have much trouble climbing out of the pit if you want to call it back either.  (DC 15 climb check)<br/><br/>Also, has it occured to anyone to try a stupid exploit or two of Cathy's swallow whole ability?