I was on level 8 of chapter 1 with the three mark 3 bow bots. If you have deflect projectiles 2 (but not 3), and you get shot at a very specific angle, about 75-80 degrees to your right the arrow will deflect through your right arm killing you.

Very nice catch! Yes I noticed this during testing and spent a bit of time figuring out the angles. You are about spot on with them, so really good hunting there! :-)

-Cheers