It looks as if the starboard shroud(s) parted. It's not unusual for the rig to come down in a real dead-stop. There's an awful lot of inertia in the weight of all that structure if it all of a sudden puts strain on one wire/plate/fitting.
Does anyone think it's a copyright violation to post screen shots of nav software? I was going to post a shot of C-Max/Jeppesen charts but though twice about whether they may object.
I've done a lot of sea kayaking around this area. It's the kingdom of ROCKS!