Fleery, Fleery, Fleery. Thought you'd know better. There's plenty of reasons for an engine to fail. It could throw a piston, break the crankshaft, blow an oil line and seize etc. In any of those cases it's not gonna produce much thrust. Usually you'll walk away from it during the day but not at night. My old flying school used to have a requirement to turn downwind at 800' at night - I used to use it during the day as well. Early ab initio training the student needs more time. After that, it's fair game to keep 'em tight. Who taught you to fly anyway?!
PM me. Cheers mate.
Incidentally, standard ct width on a Jumbo is about 2.5 nm, flying downwind at about 190 kts.