I think I do this every week now, I get within touching distance of the end and my brain goes to much and lose all knowledge and confidence.
Much like last week (and before, and before), I've gotten to the last niggling doubt and focused in on one interpretation of a clue and can't shake that it MUST be the correct one.
Of course without can be that, and of course "blocking attack" isn't necessarily something to do with parrying. I knew both interpretations of those words and the instruction, but just couldn't bring myself to see them. Ho hum...
I'm sure I'll get over this sometime... in the meantime, thank you both for the quick responses, time to properly relax for today!