Penny was suddenly much more alert than she had been moments earlier. All of her senses felt multiplied, amplified, and when the snatcher sent off a binding spell in her direction, there was only one thing she could think to do: dive out of the way.
With no idea as to whether or not it would work, she hit the ground - hard - landing on her right arm harshly. Fortunately, the movement hadn't been in vain; the conjured ropes had managed to miss most of her body, and had only wound themselves around her left leg.
Frantically, Penny tried to push herself off the ground and out of the restraints, all while quickly trying to transfer her wand to her uninjured arm, in an effort to send off yet another stunning spell - though this one less potent, of course, given that she couldn't use her wand arm so easily - in the remaining snatcher's direction, around the side of the vehicle.
She only needed to buy herself enough time to get into the car.