I can't see diving the Lanc straight down from 15-20k, bombing and pulling up from 3k
without auguring or ripping wings off.
I never ever have seen anything like that in my 8 years of bomber hunting in the MA. Never.
I agree, bombers didn't dogfight like fighters in RL.
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And few bombers are capable of "dogfighting like fighters" in AH. But in RL, they used very radical maneuvers as well, which I#m almost sure would easily been called "unrealistic" here in a heartbeat. See the Lancaster Corkscrew Maneuver:

How to:
1. The pilot (originally cruising at 200-225 mph) opens his throttle and banks at 45 degrees to make a diving turn to port (because the enemy aircraft is on the port, reverse the maneuver if enemy is on starboard.); descending through 1,000 ft in six seconds, the bomber reaches a speed of nearly 300 mph. After the 1,000 ft descent, the pilot pulls the aircraft into a climb, still turning to port.
3. He reverse the turn, halfway through the climb which has caused his speed to fall sharply, possibly forcing the attacking night fighter to overshoot.
4. Regaining his original altitude, with speed down to 185 mph and still in the starboard turn, the pilot pushes the aircraft down into another dive.
5. Picking up speed in the dive, he descends through 500 ft before reversing the direction of the turn.
6. If the fighter is still on his tail, he stand by to repeat the maneuver. The physical effort required by the pilot has been compared with that of an oarsman pulling hard in a boat race.
I want to add that our fighters also do a lot of things that "had not been done in real life", at least not to the extend they are doing it in here. Some due to modeling, some due to different combat environment and most because we don't put our lives in jeopardy and have thousands of hours practicing "the impossible".
Now for the OP:
The fighter follows you down. At the right moment, you jump planes back to the drones you left behind with the sharp dive you made. The bomber the fighter was chasing disappears and the remaining drones continues on high above the diving fighter.
Is this the way it works?
If that really works it's IMHO a topic for the bug report section.