Butch shoves the Pinkerton’s stolen gun into his pocket as he hurries toward the horses--well, he’s not so worried about needing to shoot at anybody right now; his fellow robbers have shown they’re more than willing to do so, and anyway he needs a hand free for actually getting on his horse and away.

And this is where his training and practice is very handy. His borrowed horse, Salty, isn’t bothered at all as he comes running up and jumps on. The perfect getaway horse, really. Reminds him of the one he’d had when they’d hit Castle Gate--but this isn’t a time for reminiscing. This is a time for getting the hell out of here.