[If nothing else, there's enough force behind it to knock the rat to the side. Nagisa rolls and gets back to his feet in one fluid movement. This is the absolute worst field for him, in every way...

His vision wobbles again, and he feels sick. Something's wrong. He's bleeding, but the wounds aren't deep. Can't be bloodloss.

A certain species of rat native to Africa chews a poisonous plant and then licks itself, putting a deadly coat of saliva on its fur to counter predators. Could it be...?]

Don't get too close to them, I think they've got poison! [Not sure if venomous or poisonous, in this case, but the point remains.]