After Keep or Release, after barb or no barb - now comes the really hard question.
What is the proper protocol when you encounter another fisherman (or 2) in the water

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Should you talk to him/her to get the necessary info re what to do?
Does it make a difference if the water is roadside vs. backcountry?
Does it make a difference if you saw him/her just put in above you?
If you see him/her where you were planning on putting in, how much water do you give him/her before you put in?
Does it make any difference if the other fisherman is a guide with a client?
Does it make any difference if you think you could take'em in a fair fight?