Floor to ceiling height X height of person X length of rifle minus the silencer ? A person small in stature wouldn't have reached the ceiling light without a silencer fitted.
As I see it,the light was damaged by the rifle being held high and out of reach of the person trying to grab it off the person who held it. A struggle in that respect in trying to retrieve the rifle,but not of the viciousness which has been described,as the overturned chairs,broken crockery and spilled sugar, happened when the firearms team went in ( though how,or why,I fail to understand if they'd used the " stealth " that they'd purported to have done ) More like bulls in a china shop.