Beau's a nosy motherfucker, and that means she keeps tabs on everything she can. While it's not reasonable to stalk everyone she knows, there are a certain amount of tabs being kept on who's here and who isn't, especially in the wake of Yasha's disappearance last month. All of that is to say that Beau knows Castor is gone, and has known for a day or two, but has no way of knowing if she'll be back or how long she'll be gone. So it's pure coincidence that she happens to be near that beach, hear the commotion, and poke her head around the trees.

Once she sees who it is, though, she'll swing around and cross her arms to lean against one. Y'know. all cool-like. How ya do.

"Hey. Take a good beach nap? Don't tell me you literally ended up on shore like a hunk of driftwood."