Either way he is either sitting there wasting his time or he is going to die if he actually gets ballzy enough to attack the stranded shammie.
attack the stranded shammie
stranded shammie
If he's a stranded shammie, that means you have already left. I'm pretty sure I can solo a (semi-afk) shaman. If you think you can kill me when I attack, then that means you haven't actually left him yet. If you haven't left him, that means you're sitting there watching the sapped guy, while I go sap another one of yours. You can't kill something that's not in range, and not in sight. Improved sap has an insane range. I can get a sap off on a paladin who has casted consecrate, or a DK w/ their AoE. Even if you out-smart a rogue and catch him w/ a magma or nova totem, cloak of shadows + vanish = poof, gone. BRB.

If you choose to leave one behind, he will die. You will need to run back to "pick him up" or focus on that single character to run him back. Running him back means your other 3 are doing nothing. The more time you spend running around chasing your freshly res'd toons, the less time you spend killing/capping. Your 4 toons are neutralized.

I get pretty irritated at people who refuse to pvp
By pvp, you mean Player vs Players, right? or did you mean Player vs Player?

Hey, the battlegrounds are not about killing. It's about neutralizing your opponent and capping. That's why they introduced CC abilities. In WSG, chain sapping the rushing zerg has a huge impact. They all dismount and try to find that annoying rogue pulling the "lame pranks". That's 3-4 people not defending their flag carrier or attacking ours...all because of 1 "retarded" rogue. In AB, chain sapping an opponent while a friendly caps a base, gets the base. In EoTS, randomly sapping people at an opponent controlled base will cause them to call for backup to that 1 base, delaying an attack on one of our bases. Sapping a multiboxer disables "multiple people". It creates an imbalance. Not only that, but sapping somebody over and over makes them VERY angry. They will focus on revenge and not on teamwork. Dude, trust me... when I was boxing, I hated rogues. I thought they were the biggest piece of shit class in the game. That's why I rolled one.

Not sure why he didn't just go ghostwolf.
Sadly, ghostwolf is no longer immune to sap.