When I say muscles bunching, I essentially mean the half-crouch stance involved.

I used my near invisibility to dodge your attack (by saying your character missed, essentially.) I only have 30 seconds of invisibility available in a fight, so five seconds of that is a fair price to pay considering I also took some minor damage from an attack your character just threw out of no-where mid-dodge. 

And yes, my character is a spider, he has spider legs, he sticks to the ground. My character is also considerably strong, so the pulling force he's enacting is more than enough to counter-act your jump, especially if the second web attaches.