What happened during the crash landing of Delta Flight 4819 at Toronto's Pearson Airport?

The plane hit the runway extremely hard and began leaning to the left before going sideways. The survivor described seeing a giant firewall along the side of the aircraft, with heat so intense it could be felt through the windows. After tumbling an undetermined number of times, the aircraft flipped completely, ending upside down. Passengers found themselves suspended by their seatbelts in the inverted cabin. Despite the catastrophic nature of the crash, remarkably all 80 people aboard survived the incident. The firsthand account highlights the sudden violence of the impact and the terrifying moments as the plane rolled before coming to rest in its final position.