Flares
I think the white flares are for non-emergency signal purposes. I think the shotgun shell flares packs have one white and two or three red. Even though they arent mandated on the lake I have some pen-flares and hand-helds but (I'm embarased to admit) they are out of date.
In the above situation the white one would probably be the most appropriate. Also, an anouncement over the VHF to let everyone know the situation is being handled might be a good idea. The tow captain could make the broadcast if neccessary.
A spotlight might be adequate if you know which direction the recovery vessel is coming from. If you have a Boy Scout onboard you could borow his signal mirror.... (lol.) Lashing that towel to a paddle or boat hook might help.
Just my two cents.
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