The Secret Triwizard Challenge

The spider's got eight legs; you have good odds at hitting at least one of them, so you choose to trip it.
"Incarcerous!" you yell, and ropes shoot from your wand, binding the spider's front four legs. It attempts to walk towards you, but ends up falling fast to the ground. It hisses angrily at you and begins gnawing at the ropes. They won't last long.
There's no hiding from the spider given that you're completely out in the open, so you need to either run towards the exit or shoot another spell at the spider to keep it from going anywhere. Which do you do?
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