Dealing with Rope Trick.

[NNescio]

So. . . wait, is that a way for Wizards to get around disintigrate?

DM- Bad guy casts spell at you!
WIZ- Spellcraft! What is the spell?
DM- Disintigrate.
WIZ- I have a contingency (whatever spell would work here) to become a tree for 1 round!
DM- Ok. . . he finishes, roll fort.
WIZ- No! I'ma Tree! HAHAHA!!!!
DM- . . . . . .

LOL

DM: The villain burns the tree.
Wiz: Immediate Action, I ca-
DM: You're an object. You can't take actions.