@ayosuaa
Seconded!
With an addendum: I think they will fly into a rage or the like. As far as this manga has established the demonification itself is merely a physical transformation without a (major) psychical change.
Hence its suitability for terroristic purposes is rather limited.
The plot is getting dark and serious but our fav demon (and chi-chan) family will always be happily enjoying themselves. I hope nothing bad happens to them at the concert but I ain't counting on that cuz of plot