[Thanks to reflex - and the ability to not be scared as easilly in his Hyper Mode - Tsuna's hand swiftly reaches up and grasps the arm of whoever is behind him. He tightens his grip, though not painfully and without harmful flames coming from his hand, and turns to look up.
It's not someone he recognizes, but his Hyper Intuition tells him that this person doesn't have any murderous intent presently. So he lets go.]
Who are you..?
((ooc: haha, no attacking or hitting for now~ but yayyy, Riku ♥ ^^))