His leg didn’t look so shot when he was running at the end. So. When he discovered that crazy serial killer. Who made faces. For his victims. Dexter made his own face. Put it on either that other cop that was alive or someone else. Made them run in to try and and get Harrison. Dexter close by watching everything. Dexter sees Harrison shoot the man w a “Dexter face”. Then after the cop comes. Sends Harrison away. She goes to check on “Dexter” and realizes it’s a “mask” she gets frustrated meets up w Baptista