We were out there on our 18HT...
It was like a white wall coming toward to us.
capsized of course and drifted with 5 kn to leeward
I was at the masttop bodysurfing, to prevent that the boat accidently rises it self from the wind and capsizes again.

The mainsail was almost wrecked, but we managed to get back (upwind and in the dark) to our homeport without assistance.