In the middle of the episoude S06E03 McAllister arrives with jane and lisbon at the "bella-vista" and he doesn't want to go there, maybe afraid of highs? NO.

When they arrive you can lister the sound of birds, so he starts looking to everywhere as you can see. He is indeed unconfortable there, then he left.

I dont believe that McAllister. But somehow he doesn't like birds.

That the reason he killed "Partidge" first haha