The bird was quite tame and waited a good 30 seconds longer than all the other gulls to flush before the Terror of Tiscornia, otherwise known as a poodle that's frequently walked down the beach, wandered too close.
Presumably due to inexperience it's actually clipping/shearing the (essentially calm) water with the outer two primaries.
Later, in the evening I received a phone call about a Yellow-headed Blackbird at a private location.
The bird couldn't have even taken an hour to re-appear amongst a cowbird and RWBB flock. Based on Sibley this would probably be a 2nd year male given the small white pocket handkerchief (primary coverts). It's not as straightforward in Pyle where a person might be able to make a case for several age groups. Perhaps better photos will resolve the issue, digi-scoping in this case would have been better. Whatever its age, it's my 300th bird for Berrien Co.