Sectumsempra and the DEs

[gelite67]

No: HPFGUIDX 151410

Any theories as to why Harry didn't use Sectumsepmra on the DEs at the 
end of HBP?

He tried it on the dead bodies in the cave, to no effect, but not on 
the live DEs upon whom, presumably, it would have worked.

Seems like it should've been no holds barred -- he'd just witnessed 
Snape kill DD and he believed someone in the Order (or perhaps a 
student) was dead.  It just seems odd to me that he wouldn't have used 
that curse on his enemies.

Angie