I have mentioned this before. It's not against the rules, and I think that would be a tough rule to impose anyway, but it is a cheap tactic. I've decided when I PvP with someone and they use one of these cheap strategies (using their enemies bs as a shield is another) I wont fight. I'll just say //gf and cruise away.
<span style="color:#FF0000"><strike>RETIRED</strike></span>
ON MY WAY OUT OF RETIREMENT