Had it happen to me...
Years ago, during take off right about at V1, had the left engine N2 seize. Thought the left wing was coming off. Whole airplane shook like crazy. First flight of the day; early morning departure. Woke us up for sure.
This was only for a few seconds. Once the N2 was completely stopped, all the violence stopped.
Our SOP at the time was to execute the “Engine Fire, Severe Damage, Separation” checklist. Since we never got an actual fire indication, we stopped the checklist just shy of discharging a fire bottle.
Can’t remember what actual N1 and N2 RPMs are at take off thrust, but it’s a lot. (Maybe 14,500 RPM....dunno?)
For such mass to come to a complete stop in a matter of seconds, it’s a violent experience. I know this; it actually happened to me.
Fly safe,
PantLoad