I had nothing but my 4x5 camera, but luckily brought my 300mm f/9 Nikkor-M. But f/9 is pretty slow and it was getting dark as the sun was setting. I was persistent though and nailed two shots of him! I was pretty lucky, as I more or less guessed where to focus as he was constantly on the move:
The second shot was even better, and luckier. He was very close, and not staying still at all. But then another hiker showed up with a dog, which he reacted to and stood stock-still long enough for me to shoot this:
I shot both of these wide-open on the 300mm. Even that wasn't really fast enough, but instead of attempting a 1/8 of a second exposure, I just shot it at 1/30. I then developed it in Acufine, stock, for 4:30 at 70F. This developer gave me a bit of a speed boost - just enough to get really nice shadow detail at an effective ISO of 800. Normally for T-Max 400 I rate it at about 200 for development in Pyrocat HD. But it worked out, and I also now know how to get some extreme speed from my TMY if I need it!