I met this same guy last night i think, it was in the same spot as you mentioned it was later that night, but the guy said he had been there since 4:30.
I ended up talking to him and he said he was from Edmonton and this was his first time fishing the bow. He asked me about the limits, he thought he was allowed two fish, but i told him only one under 35cm. He had one already on a piece of rope attached to his belt.
I had watched him play a smaller fish for probably 15 minutes before he brought it in, so i was giving him some tips on getting the fish in quicker.
This might be a good time to post this link to Alberta's Guide for handling fish.
http://www.srd.alberta.ca/fishwildlife/fis...eleasecare.aspx