The whistle is an irritant. So we don't want to overuse it. Obviously it's proper to use it to draw people's attention to your call. At that point, you need to interject yourself into the situation. But I think it's better to forgo the whistle when it doesn't add any new information, or there is no need to get people's attention. In this case, you've already got people's attention; a simple signal will do all the communicating that's necessary.
I have had partners do this during games, and it bothers me a little. It seems a little like piling on. Leave it to the announcers to scream, "And the bucket too!"
Just my $0.02
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