Payday 2 - Easy method to complete Mallcrasher on Deathwish - HD

Buy the Gas can(s) asset in the preplanning menu, do 50.000 dollars worth of damage at the stores and then light a Gas can in the store next to the Escape spot. Enter the store and just stay behind the fire where the police can't reach untill the helicopter is there (possible wait out any ongoing assault too). Then run to the helicopter. This way you should be able to finish Mallcrasher on any difficulty easily.