multiple radip grenade throwing...?

i was in a harbor game and there was this guy on the roof....and he was throwing grenades like HELL

is there any hack for throwing the grenades or getting on the roof in harbor....?

Yes they exists. Those hacks are called "RapidFire MP7K" for fast shooting anything: like nades, full auto pistols or even sniper ; and to get onto roofs theres an option called "SuperJump" that make u jump very high so u can land on any rooftops. The sad part is that those options are only included in VIP or Private hacks, so u need to pay in order to use them. I hope this helped !