Tilting her head away from the beam in reflex, Rose didn't waste any second and jumped out of her chair, onto the pony attacking her and landed on him, wrapping her hoof around his neck to firmly hold him in a headlock. To make sure he wasn't likely to shoot again and hurt anypony, the Captain took a magic blocker and quickly placed it on his horn.
"DON'T YOU DARE MOVE!! YOU ARE UNDER ARREST FOR VANDALIZING CANTERLOT AND MOST OF ALL FOR PONYCIDE ATTEMPT ON A MEMBER OF THE ROYAL GUARDS!!!"
It was clear by her yell that she was furious, and it was better for anypony to refrain from making it worse.
"Arrow, call Foedus immediately! I might have the pony he's looking for!"