When my family first got a kitten he hid underneath a bookcase and we thought he had jumped out a window... terrifying. And a really good lesson. Everyone was in tears and you can bet we never made that mistake again. Batman (super cute name!) doesnt really know that this is home yet so hes pretty eager to head out on his own, caution is the name of the game here. Also, no off-leash activites for at LEAST a month after you get him, even though 2 weeks in it will feel like you've had him forever. When you do let him off make sure its a securely fenced area for practising recall.