The Dink Network

The tree burning happens within dam-fire, specifically the damage procedure. The script checks to see if the hit object has the sequence and frame of the proper tree. If the target is in fact the correct tree sprite, then it causes the tree to burn and sets the editor info of the tree to stay burned.

I think Pillbug has the right idea. Within your weapon script use procedure, create a stationary missile in front of Dink with a modified version of the dam-fire script to burn the tree.