It's as Lambert starts cleaning out the animal that Strange realizes he's just so tired of this. He could continue to hound Lambert and bother him, but what's the point? The witcher obviously doesn't want to talk. Strange could be doing so many better things with his time.

He is going to try and get the last word in, though. Because he's petty like that.

"The worst thing about all of this is that I'm happy for you," Strange explains. His tone is a mixture of tired and annoyed as he continues talking. "It'd be so much easier for me to hate you and yell at you for keeping this a secret for all those months. But I'm happy you found someone and you're comfortable enough to say you love them." There's a pause. "But God in heaven, you two idiots should have done this differently."

Having decided that's enough for him to say, Strange hesitates for a moment before turning his back and starting to walk away.