The way it works out in my head, at least, is thus:

- Bear sees fish.
- Bear wants fish.
- Fisherman gives bear fish.
- Bear sees fisherman.
- Bear decides he wants fisherman, too.
- Fisherman displays gun.
- Bear ignores gun; guns can't talk, silly.
- Fisherman fires gun in air/into river/somewhere he's not likely to hit something accidentally.
- (AP1) Bear gets message, leaves with fish.
- (AP1) Fisherman enjoys rest of morning.
- (AP1) Bear perhaps remembers that guns can, in fact, talk. Loudly.
- (AP2) Bear ignores message.
- (AP2) Fisherman fires gun again, this time at bear.
- (AP2) Bear either gets message and runs (possibly with fish), or bear gets dead. Follow either outcome to logical conclusion.

There is of course a third alternate path, but it's a bloody mess.