Ok ok, I'd probably say the damage to the object should be a bit more than 1:1 with people damage, just because I feel like people damage should be worth more, but I'm not gonna be like hard policing like the area ratio or anything, just if a person gets a gash, maybe the object can still break etc, but I'll let you decide on flavor text.

The limit to energy aka not being able to do this for all 80 guests plus already having to transfer should be fine enough!!