Just a Polar Bear, Moseying
Hank wasn't happy with how things had gone. He'd transformed, painfully, and nearly wrecked his lab before he got ahold of himself. The table on its side had shown him nothing but a giant white mass, and between that and screams of "BEAR!" as he made his way out of the hospital as carefully and timidly as possible made him almost certain he was a polar bear.
But how on earth had he become a polar bear??
Thankfully he still had his wits about him after the initial panic subsided so he'd gotten out and immediately made for the only individual he thought might have an inkling of what was happening.
He was worried briefly that he couldn't properly remember the way back to the blue box, but as he left the hospital he found his way back with relatively little issue. Luckily it was right where he'd left it last. Right in the park, where it was hidden and safe to approach.
Still, before he did the giant bear stood up to his full height, some fourteen feet, looking around and then landing heavily. He just didn't think it would do for somebody to panic seeing a giant bear attack a blue box. That would attract attention, and the Doctor probably didn't want attention. People snooping around a space ship. Hank didn't like people snooping around his lab (unless they were pretty redheads) and he didn't even live there, technically.
Making his way over Hank sniffed out the door (which was easier then getting used to these eyes enough to find the door visually) and then lifted his paw, gently as possible hitting the wooden door with the back of it so he didn't risk injuring the wood. It was still a mighty set of thuds, however, and Hank winced, then sat back on his haunches in a very human-like manner. He filled up the doorway, head hung low and almost to his belly, waiting to see if the Doctor answered and feeling a great amount of shame for coming to a man he didn't know so well with such need. But even if Hannibal might know something of what was happening, he was probably back in the hospital, and Hank couldn't stand all the panic even his careful wandering had caused. No wonder that wolf had been so upset.