Honestly, fighting Archer like this is probably an easier thing to deal with than if he were to live up to his class name. If there's a local vantage point sufficiently high enough, he can easily make a short against a roughly human-sized target from two and a half miles away. Combined with the ability to shoot NP swords, it's better for PC's (and NPC's) to have to deal with him in melee, since at least that way there's not this enormous buffer of 'you can't hit me'.

Basically, it gets easier to try and kill Sorin if we allow a peace at this avenue. Unless he then doesn't go outside the whole RP, someone far too stubborn for their own good will try and finish him off.