First mistake was not establishing distance limitations specifically. In my experience that may be stated on the outfitter's web site or in the paperwork the hunter signs when registering on arrival, even if it's not stated verbally.
For those saying take the shot anyway, on the three guided hunts I've been on, one in Canada, two on private ranches in the US, the paperwork signed has included some specific rules. It is, in effect, a contract. I scanned the pages quickly so I don't remember all details. As regards hunting behavior, you are under the control of the outfitter and the guides (think about the outfitter's liability insurance and terms).
When ignoring directions of a licensed outfitter/guide on private land in the US you may well be committing a game violation, or worse.
As to the "what is he going to do" statements, the outfitter is guaranteed to be on a first name basis with the sheriff and game officers. Often it is not better to ask for forgiveness rather than permission.
I don't know Canadian law but ignoring the outfitter/guide in a foreign country would probably be a bad idea.