Days later, in Polis was Lexa and Clarke was talking about peace for their people. Octavia told Clarke she has a hour to say bye to Lexa. They said "may we meet again" to each other.
Next, Titus wants a war with skai crew, but Lexa wouldn't let it happen she wants peace with them. He thought that if he shot at Clarke than Lexa will delcare a war. He waited for Clarke to come to her room to shoot at her.
She came to her room to pack to go she saw someone that she know than heard Titus talking to her. During, Titus shot at her, so she moved out of the way of the bullets, and Lexa heard the loud shots and ran to Clarke's room to safe her's love of her live.
She had no weapons on herself, but she just want to safe Clarke. She made it to the room's door and almost got hit by a fast bullet, but Clarke pushed her out the way and got hit by the bullet in her arm.
Initially, she was in pain and Lexa was piss and yelled for her guards to get Titus out of her sight, and get Clarke a healer for her wound in her arm. Clarke felt happy that she saved Lexa's live. Lexa killed Titus for trying to kill one of her allies.