The First thing you do is shoot of the arms of an elite or solder that have been transformed into those flood thingies. (But make shure that you didnt blow of his head.) And now you have a flood as a pet. (Sort of ?)
The nice thing about these pets is that you don't have to feed them or take care of them.
But wait... it gets better. These pets are disposabe. (As if you didn't know.)
Well have fun with your new pets befor they kill you
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In Halo 2, they explode and turn back into infection forms if you cut off their arms.