Bent chainstay - trashed bike- uncommon?

maybe you could still check chain tightness !

and came to a skidding halt with the right chainstay pulled about 1.5" to the right and big crimp in chainstay. Condor say it's unrepairable.

Bit difficult to check chain tension in these circumstances.
What's the frame material, and what was Condor's reason for saying it was unrepairable?