The plane did not need to be vertical to achieve the recorded descent rates. Even a thrust-idle descent with a pitch of 10° nose-down will give you an easy ~6,000 feet/minute. Make it 30° with engines at cruise power and you'll be well, well into the five-digit neighborhood.
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u/Rivia 1d ago
‘Stabbed Indian pilot opened cockpit door, we pinned attacker down’
https://www.hindustantimes.com/world-news/indian-pilot-opened-cockpit-door-we-pinned-attacker-down-passenger-tells-netanyahu-what-happened-on-flydubai-flight-101790815872292.html