That was really poorly written way to move the plot forward (get Idris to the back of the plane). After building up Idris Elba's character as the smartest guy writers have him make the dumbest move.
When they realized bullets were fake instead of rushing the main guy (who is alone at the front and Idris already punked before when he grabbed his gun hand and easily overpowered him) taking the cockpit and just closing the door, they have him sneak all the way to the back of the plane
And at the back there he's losing a fight to the old geezer that got slapped by Connor McGregor in that bar. Man looks like a part-time plumber that struggles getting up under a sink and then spends the rest of his day getting plastered down at the pub.
Other than that it's a great show.