Let me tell you first, that I'm no stranger to remote tidal beaches at night. Over the recent years I encountered on the beaches variety of birds, sea otters, dogs and even an odd seal.
Last night I had an odd encounter. I was fishing the mark for about 1.5 hours. It was just about 30 minutes to low water when two seagulls appeared. They started squawking and circling around the place where I was wading. At first I ignored them completely but shortly it was clear that they were not just passing by. I've never encounter seagulls hanging around at this particular mark before. Shortly the noise became really annoying - I guess that was exactly what the seagulls were trying to achieve - annoy me

They lowered they flight a bit but I had no reason to think that they were aggressive towards me. However, prospect of potential dealings with their pointed beaks wasn't encouraging. I was going to get going home soon anyway so they helped me to make that decision sooner. As soon as I walk they were gone too.
Two questions arising from this. Firstly have you ever actually been attacked by the seagull in similar situation? Secondly does presence of two squawking seagulls impacts behavior of the fish?