Hot answers tagged forced-movement
All of it. But it may end up squeezing if they are partially over the pit. If only part of a creature's space is over a pit or precipice, the creature doesn't fall (Normally a creature ends up in such a position as a result of forced movement.) On the creature's next turn, it must either move to an unoccupied space that is at least as large as it is or ...
All of their space has to be over the pit. From PHB1, p284-285: Falling Large, Huge, and Gargantuan Creatures: If only part of a creature's space is over a pit or a precipice, the creature doesn't fall. The Rules Compendium has the same information on p209 along with the following addition (might also have been added to PHB1 via errata?): ...
You cannot push a creature when there is an obstacle in the way. From DDI: Corners: When an obstacle fills a square, you can’t move diagonally across the corner of that square. and a target cannot be forced through blocking terrain.
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