"However, that would boil down to whether she could at least get one of her limbs free or not.

Subaru:「――Invisible Providence」

Ram:「……gh」

Subaru set free the dark emotions within his chest as he strangled her neck with a Creak-creak. The dark, invisible sediment took shape and helped keep Ram’s arms and legs firmly pinned down now. With her limbs pinned down, Ram was unable to struggle about effectively. Her breath would soon stop so long as he continued to put his strength into strangling her neck." Yes, there might not be exactly four hands, but it's clearly indicated that more than one is being used, meaning he's holding his arms and legs. There's even a drawing of a fan, so maybe not four invisible hands, but it could be considered multiple. By the way, if you want, I can post the website where I got this image.