[He's been witness to all the teleporting going on and is pretty impressed by the ability as he was the first time he saw it. It's proven pretty helpful in this situation, too.]
Is it smart to keep this up? You're bound to get tired if you don't take a break. [He doesn't know what it's like in Cisco's world, but everything he knows about teleportation in his world tells him that it might not be a good idea to keep pushing like this.]