The Skill
Remember when people actually jumped to get headshots? not do the gay-ass ground headshots.
Those 'gay-ass' headshots are what is correct, the jumping is retarded.
No, actually I think that the jumping is the actual thing that should work.
Ever seen a spider on the ground bite someone's head? OUTSIDE of your computer? No? Here's a tip: when you decide to go realistic and try a jump-headbite, jump sideways. do NOT jump straight into his face, this would mean jumping into his crosshair and BLAM! your dead. a jump from the back is preferable. And i'm not talking about sideways jumps as in jumping FROM the side, but as in: when facing the hummie:

............

hummie & dretch facing each other

.......--------*
.......

--
dretch jumps in hummies general direction, but jumps slighty sideways so it would originally miss the hummie. hummie thinks dretch is jumping straight: shoots, misses.
(Edit: hummie could also think the dretch is jumping the other way, and turn the other way to shoot, resulting in a very comical death. This also means some ppl could see where your going and shoot you anyway. In this case, it would be an idea to run past them, turn and jump at the back of the hummie's head.)

.......--------*

-------
Our hero the dretch turns in mid-air to face dazzled hummie and bites automatically.

.......--------*

-------
Dretch falls down and continues facing hummie, biting toes. Hummie dies.
LEGEND: a ' . ' is nothing. only used for space.
a ' - ' is the dretches path.
a ' * ' is where the dretch started.
a '

' is used to sybolise a gravestone. (dead hummie)
a '

' is a hummie that is not yet dead.
a '

' is (duh) a dretch.
I'm not telling anyone not to use the 'realisticly-seen-impossible' ground headbite, but i'm just saying that a jump would be more realistic. (and, in some cases, more fun

)
Egad lol this post looks so huge.