RIP.....odd way to go.....The Redwoods are magnificent but they have relatively shallow root systems and are prone to this.
BS Redwoods are very stable as they spread roots wide.
I used to live off winding Tyne Blvd in hilly green hills area of Nashville
After heavy rains we had a large hackberry tree fall across that well traveled road at a precise unfortunate time landing on a woman’s suv striking her but sparing her children in the back seats
She died a few days later from head trauma
It happens