Determine whether the following disputes are verbal, factual, or some combination of the two. If verbal, discuss whether the dispute arises from vagueness or ambiguity.
FRANK: Look at that huge tree that fell last night. It must have made a tremendous crash when it came down.
SHIRLEY: No, I'm afraid you're quite wrong. Sound is a perception, and perceptions depend on a perceiver. Therefore, since nobody was around here last night, there was no crash.