Because the basher generally has less protection, he'll die quicker. Basher also puts out more damage, get that out of the way and there isn't a lot to worry about. And once the basher is gone the summoner, if a shaman, can disel to his hearts content he won't have anyone to lag you out, so you can flee and resanc or whatever. Remember you and Hunsobo in the grove against Mendecirith and me? Summoned Hunsobo and got him out of the way before you could get anywhere near. If we had gone after you Hunsobo likely could have made it to you in time, or worst case you both escape. If the person easiest to hurt also puts the most damage out I generally go for them first.

"Knowledge speaks, but wisdom listens." - Jimi Hendrix