BBC Sport's cricket analyst Simon Hughes uses Hawk-Eye to demonstrate how Jonathan Trott's technique leaves him vulnerable to Australia's aggressive bowling.
England slumped to a humiliating 381-run defeat in the first Test in Brisbane as Mitchell Johnson once again blew their fragile batting away.
Hughes believes Trott could learn a lesson from team-mate Ian Bell when it comes to dealing with the Australian attack's aggressive approach.
Missed the action of day four? Find all you need to know from our Ashes catch-up page.