As the Magic Barrier was perfectly established, Caesar could leave the vicinity of the tunnel with Basil, and ran to the cell chamber. He could just teleport himself along with Basil, but Basil's condition didn't make [Teleportation] possible.
Even if Basil didn't show any sign of being in pain, he knew how much pain Basil must be enduring. He couldn't just exacerbate the situation by letting Basil experience Spatial Bump; he would worsen the injuries Basil had.
Therefore, he could only cast the best Motion Spell he had on his body to accelerate his travelling speed.
Knight undoubtedly had a way more durable physique, and ridiculous strength than any other human being. Still, Knight or not, once one is injured, one still feels pain.
In some instances where someone with Knight physique got injured, it would mean the magnitude of the attack they had received wasn't something one could scoff at.
