14 Weeks/BC behavior sighted!

Fourteen weeks old to the day and a classic, BC behavior has been observed. Yesterday I sprayed the hose in the backyard, and Trigger was intensely thrilled and started chasing the stream of water. Prior to this he was really not interested in hoses or water spraying. Big change in attitude!
This could be a lot of fun and a great way to get him tired out, but I am not going to toy with this. I understand that BCs can get very obsessive-compulsive over water, shadows, flashing lights, laser beams. etc. and I do not want to encourage that!
I have a feeling we are going to see a little changes in the little man over the coming weeks.