Manipulate
"Dude, I had been waiting when you will hand this can to me, thanks" Jack patted David's shoulder and drank the can in one shot.
"I just love this beer" Jack exclaimed and within twenty seconds, he fell in a deep slumber, sleeping on the car's back seat.
Chance and David looked at him, with regret in their eyes, "I hate involving him in this plan today" Chance exclaimed sadly while following Isaac's car.
"Hmm, but we have no choice. Jack should never find out the truth, we are doing this for his own safety" David too was not happy about it but he, Isaac and Chance can't leave this party, without Jack as it would look suspicious.
Therefore, David mixed a strong sleeping medicine in this beer before giving it to Jack.
He won't wake up for another six hours due to this medicine.
"Hmm, in a way it is good Jack would be with us. He should be at least physically present while we kill Lucas' killer" Chance commented.