Crusts and Crumbs
Grabbing wildly about for anything to defend yourself against the beast, you grab the severed leg of a former adventurer with one hand and hang on to the web for dear life with the other. The spider slows in front of you, as it tries to think of a way to eat you without a side of left-overs. This gives you a chance to run like mad, as you already feel quite comfortably insane wielding a severed leg. Also, releasing your grip on the web would be preferable to becoming a late-night snack. There is a sword glowing an incandescent blue, which was hiding under a spare abdomen before you dislodged it looking for something to swing.