Yes that is a good point but remember, part of a siege in GOT is killing every FUCKING RAVEN they see, and Lorch will be no different.
And remember, if no RAVENS get into KL Wilas will have NO idea Garland has even left hightower, AND the westermen have scouts watching the reach who will report Garlands movements to Lorch, who, being an aggressive son of bitch will-... you know what? I'll not go any further, though I guess I'll write it up on the pad if you and [@bluetommy2] want to mediate