Sagan was visibly happy with getting to stay with Kate. However, his celebration was short-lived, as soon he'd end up fainting from the dizziness he'd been feeling. Lucky for him, he was pretty safe alongside Kate. To her, the blackout probanly didn't seem like more than Sagan trying to catch a few Zs. Thanks to Kate letting him stay, Sagan fainted in a safe place, but who knows what could've happened had he been out walking alone.