You were on your flight far away from your home town. The flight so far is very chill. You were sitting next to a man, who was just staring out the window and looking down into the night below.

You were about to sleep, when the plane just...shook for some reason. But you didn't think anything of it. That is, till you heard a panicked voice through the speaker speak, “Attention! We're doing a crash landing. Please buckle up and sit down!” And then, the plane started to descend...rapidly.

Soon, the plane hits the ground and your vision goes black. Hours later, you awake to find it was day time.

You groan and grab your head, feeling it throb. You were extremely disoriented and confused.

You unbuckle yourself and look to your left, seeing your seat partner unconscious. You weren't sure if he had made it or not, but you decided to shake him.

Immediately after that, the man twitched and opened his eyes, making inhumane noise.

You immediately check your pockets and you found a syringe. You look at the man, thinking. You could give it to the man and have a higher chance of survival, or you could keep the syringe just in case you'll get infected too. What is your plan here?