This evening Ty was really restless. He started on the east sign, then went to the NW corner, then he was off. It looked like he was chasing off a several other falcons. He drove them away really quickly, but it looked like a total of 4 falcons (including Ty). Then he was back to the NW corner, then the west wall, then finally the south sign. He then decided to check out his stash of food and have dinner. About 7 pm, Beatrix showed up and took up her spot on the east sign.
I wonder if one of the four falcons was Beatrix and she pursued them further away, while Ty returned to the building.