The Secret Triwizard Challenge

You cast the curse quickly, and all eight of the spider's eyes swell shut. Apparently, spiders can get pink eye. Who knew?
The spider shrieks and rubs at its eyes. It's so preoccupied that you're able to sneak past and run like heck to the exit. I guess you finally made a smart decision, huh?
But this is no time for reflecting on your very, very few smart decisions. You need to win this race!