Well you've got Jedi and Sith who can just throw the ships Halo has out of the sky.
English
-
... *Single flood parasite enters said location said Jedi/Sith is*
-
*Jedi/Sith sense the parasite with the force and destroy it before it even knows what happened* Seriously, the slightest amount of damage kills them, they can little just pick it up and throw it against the wall with their mind and it won't distract them from throwing ships.