That's pretty lame how agent hunters drop first aid sprays. They should fix it so they give you maybe a green herb or something.
It's pretty lame that agent hunters can spawn non-stop till they leave or you finish the area, play on professional mode or no hope mode with no healing items, good luck staying alive. when you pretty much will be put in dying status in 1-2 hits. the second hit usually killing you.
If you don't want them to drop 1st aid sprays then stop letting them spawn continuously.
"I'm sorry squeeky, it's just a game, you got to get before you get got"