Undercover Bodyguard

Zayn's POV
It had been about fifteen minutes since Trinity had disappeared inside the building to visit, was it her sister, I think. The lads and I were getting kind of anxious, so I decided to break the ice.
"So, guys, what do you think of Trinity?" I asked, curious as of what they think. They all nodded and gave some small shrugs.
"I think she's very beautiful for a young girl. It's surprising she wants to be our body guard considering her life is possibly on the line," spoke Liam. I nodded. Trinity was very beautiful, but I had Perrie, and she was all I needed. I didn't want the lads know how Trinity and I were connected somehow. Louis spoke up next.
"I sure hope that she's okay."
"Guys, look! She's coming this way, and, and she's running..." Niall trailed off. She wasn't looking at the van, she was looking behind us. I turned my head and a blonde headed girl a bit younger looking was heading for us.
"Lads, get down!" I half screamed, half yelled. We all bent over in our seats, undoing our seat belts so they wouldn't hurt our stomachs. We all huddled in between seats in the small space as we heard Trinity scream at the girl. I popped my head up so I could get a good look at the two of them. The stranger was nowhere to be seen and I could faintly see Trinity's tiny body disappear around the edge of the apartment building. My eyes widened in horror. She could be killed. No, I made a promise to him. Promised she would never be hurt.
"We have to do something!" The other boys looked at me in confusion. Harry looked at me from the other seat, his eyebrows scrunched together.
"What do you mean, Zayn?" I gripped the seat in front of me and pulled myself up so I was back and sitting in the seat.
"Hey," I called to the driver. "Can you get a hold of Paul?" The driver nodded and dug for something in the front passenger seat. I willed for him to make it quick and in a couple of seconds a walkie talkie was in my hands. I clicked the button and spoke into it, my eyes still training on the spot Trinity last disappeared.
"Paul! Paul! We need help! Trinity just went after a random girl! When need you to get in contact with her!" My voice was urging and I was waiting for his response. "Yeah, man. I'm talking with her right now. We got back up coming to protect you guys." I shook my head no.
"No! We don't need it, she does! Paul listen to me! You have to get her out of there!"
"No, can do, Zayn. She said if we don't get back up to you guys, she will quit because she doesn't want the blood of someone else on her hands." The words rang through my ears loud and clear. The accident that happened years ago, still hung in her mind. I mean, how could she forget? I fought back the tears that were forcing their way out of my eyes. No, it isn't going to happen. She can't die like this! I guess all we could do was wait.

Notes

DOUBLE UPDATE! It may be a bit short but oh well. So, I will try to do a triple update later on today to make up for all of those weeks.

QUESTION TIME:
How are Zayn and Trinity connected?
Who was the promise made to?
Who is the person trying to get a hold of the boys?