[Byleth had been tense when the bird made to take flight, worried that it might end up carrying off Gray, but he relaxed when she managed to leap off in time and the bird took off to the skies, successfully driven off without harming it.]

It's likely there's a gap in the greenhouse's roof somewhere, and the birds came to forage. Blackbirds tend to hunt on the ground, rather than catching their prey in midflight.

[Prey being bugs of course. Also easier to pick up fallen berries and the like.]

In any case, are you alright, Gray? You weren't hurt while wrestling with the bird, were you?