A spy/infiltraitor is both helpful an indeed defensive (sometimes)

:i think not

:ill blow that darn look out of your face son

:wha?
Infiltrators are not alwas running around invisible all the time they can do a sizable amount of damage 28 dmg/sht
they have a capacity of six ammo and has a reload time of 3-5 seconds (i really dont know)
You can help a

push through any enemy
by using yourself as a shield for them (just remember to turn back if you've got a big damage done on you)
Most of your team dont care for you like:

:he slows me down

:mmf mmf mmf

:hes a maggot

:he small ant,very tiny

:hes a bigg mess i tell ya

:he destracts me ALOT

:i just hate them

:just antother helpless idiot in the team

:he gets in my shot
These comments are true (really even the spy is right)
But you can help them

- Distract enemys like

and so on by running around and when the time is right bam
the runner enters and beats the crap out of them "grrrrrrrr"

- They usually dont need help but if you see them running away and being cahsed down get your
gun and begin shooting (at the enemy of course)(also passive invisibility)

- Rockets are slow but who said you are. While being chased (as a form of distraction/really
just being chased) use the rocketman's rocket and run straight towads it and enemy will follow,then
he rocket spams "more grrrrrrrr"

- hes very slow why not stand back and help him when he has low health (you HAVE to toggle the health
meter thing on your options menu to see your teams health)you cant tke the next shots as previously stated
earlier

- like you do with rocketmans lure enemys to these traps (just make sure their not firebugs,rocketman
nor demolitionmans or else)

- he can use you as a meatshield although you have to doge some bullets or atleast protect him
when you see an enemy comes from behind him while he's healing a teammate (still be a meatshield)

- have you tried standing at least a distance behind his autogun and wait for enemy infiltraitors to
stab them

:free autogun

(backstabbed)

:you've got blood on my suit

:yeeeehawww

- is it normal when someone thinks an infiltrator is about to die then something suddenly blocks their
shots hmmmmmm??

- randomly shooting behind them is helpful i guess?
now for a more informative/better tutorial go to this link : guess what its not yet done :DD