You and Jack were hanging out in his room. Since you met him he had a habit of bitting his tongues whenever he talked very fast. Like now, He was talking with you about his last mission while he had his claw on your shoulder.

He bit his tongues then lifted his mask to his nose and spat out the blood in the trash can next to his couch.

Jack: "Fck- I bit my tongues again..." He said angry at himself, before he looked back at you