Hmmm...as blue lasers are not that easy to get and use I would suggest that it was some kind of searchlight.
A green laser could have been used. But they are nothing for kids (too expensive at least). Example (which looks blue but is actually green...):
(Image by
University of Kaiserslautern)
Correction: Blue lasers (Argon) are easy to get. Sorrry, I had thought about semiconductor type laser...