for levels with bacteria immune to infection, when you big enough ,get infected, then you can hunt down the little ones without fear. if you keep eating enough, you wont shrink or die
even when i had bloody tracks leading to a big blood splatter they never looked for me, but when i had no tracks and hadnt been found, 3 guards went and stood on top of me... screw you blind psychic guards!
funny glitch: on the 1st sunset city level, if ur the bowler brothers, you start going downhill before the "on your marks" so by the time it says "go" ur most of the way down the hill