Blackjack waited while Elena went to the restroom. He took the chance to borrow the keys to Xander's motorbike, knowing that they'd need something to leave with because Blackjack rarely drove his car.
"I'll get this back to you in the morning with a full tank, I promise." He said, pocketing the keys and turning to Stacy. "I'm going to need you to stay sober long enough to make sure everyone gets home. I'll make sure Elena gets home safely."
His cause for worry was the attack on him earlier in the toilets so he had to be certain that none of his friends were going to go through the same thing. If anything, it told his attackers to step up their game. Not only was he risking himself and his friends but he was putting Elena's life in the balance. She's important, someday she'll have to realize that.
Once she was out, he escorted her to the bike.
"You sit in front." He said, getting her to sit so that her legs were dangling off the right hand side of the bike.
He sat behind her, twisting his arm around her slender body to slot the key into the ignition.
"I'm not getting fresh with you here. If anyone comes after us, I have to make sure that you're safe, regardless of what happens to me." He explained, putting the bike into gear and driving off.
Blackjack knew that this way, if they tried shooting at them, he'd stop the bullets from hitting Elena and severely injure him in the process but unlike her, he didn't matter.