Shine the light off to one side of the brooder, so the chick can move away from it if it's too warm. The towel is a good idea, newspaper tends to make the chick slip & slide.
I'm thinking the legs look "weak & the toes are curling", possible vitamin deficiency. You may want to get some...
Tried you on FB but nothing ... To download a video, you need post to You Tube, then upload here. PLEASE read aart's post, it's very possible the heat in your brooder is too intense. Meg-in-MT & Mysticalys also mentioned heat, please check the heat in the brooder.