Quote Originally Posted by Hand_of_Vecna View Post
I guess I'm not a reasonable GM then and neither is the OP since he asked about the RAW of it. Seems like a coin flip kinda situation to me, unless you got especially fragile vials for specifically this purpose, but then we're homebrewing fragile vials rather than using RAW.
Apples and oranges - he was asking if there was an explicit rule that covered his situation, not if dropping a glass bottle containing magic napalm would be reasonable. (Obviously he thinks it is, since he planned the encounter that way.)

How fragile the vials are depends, again, on how you define impact.