The Human Warrior Form is significantly smaller than the Covenant version (due to the comparative differences of the host bodies), and is both slower and weaker than its Covenant counterpart (though it has the same jumping ability). It shows a preference for human weapons, and can be deadly with a shotgun in close quarters. As with other Warrior Forms, it is capable of sustaining massive physical damage before being unusable to the Flood Controller; in fact, as long as the chest cavity and legs remain intact, it will continue to try and fight.
-- from halo.bungie.org
's "Anatomy of a Flood" section.
Specific Link: Human Warrior Form