Chap 15, hoist by one's own petard

[Mark Kohut]

An unemployed musicologist named Petard.......dedicated to finding the lost 
Vivaldi
Kazoo Concerto.....................

petard---explosive device which blows open gates or towers....
A little self-referential joke by our kazoo-loving writer? 

'hoist by one's own petard".....
http://www.phrases.org.uk/meanings/hoist%20by%20your%20own%20petard.html

And, if that concerto could be found, would the 'blast' lead to a new perception 
of reality as
does the blast to Lew in AtD?