OK, I am reading the series for the second time and have a couple of questions.

1) Why did agent Benn's Hexbelt turn to goo (Fool Moon), everyone elses had to be burned? 

2) When Harry burried Lasciel's coin (Death Masks); why didn't the wet cement disrupt the circle? Harry broke the Shadowmans circle with a film canister.

Thanks

Curator's note:  This topic contains a lot of great discussion on the nature of the Prison Harry built for Lasciel's coin.