When the gun shot victim (Adrian) enters the bakery, Escano hands Anna a first aid box and tells her to sew Adrian up (to stop the bleeding). First aid kits never, ever contain suture (sewing) materials. Suturing is an advanced skill, not first aid. Suturing is to be done as close to sterile as possible (sterile gloves, materials, cleaning the wound, etc.). Suturing requires training..type of needle, thread, method and so on. It's not the same as sewing a button on a shirt.
In addition, just sewing up a wound does not necessarily stop the bleeding, there's internal bleeding, especially in the chest/abdomen areas.