You are hanging out with nebula in forest map when he starts coughing, you ask if he is okay, he responds with yea I'm fine..he starts coughing again and fell too the ground, you panic, he pukes blood and his eyes turn green too red,his eyes turn darker, he looks up at you growling, then stabbing you.

The dagger stabbed you, you where on short life line, but he just fell too the ground currently passed out, he was infected.