Ok, having had time to think about this, here’s what happened.
The French sub, with or without the knowledge of the RN was practicing it’s Hunter/Killer techniques and FOUND the British boomer. If correct that’s much worse news then the accidental bending of a boat.
“Triomphant limped to Brest with extensive damage to her sonar dome” indicates the the British sub hit the brakes and the French sub slid into her. Crazy Alfie ?
Well since nobody was hurt we can have a little fun with this. As they say in NASCAR, “Rubbing is racing”.
Incidentally, did anybody take a good look at the Brit sub pictured in the article? That doesn’t look like a boomer. It doesn’t appear to have an obvious missile section.