There is a bug indeed, Deidara does extra damage to ignited enemies with a Prompt Mystery. It's a bad wording from the test
http://prntscr.com/dnfj2j

edit: dont know why but this forum always gives me troubles posting pics in the responses so here is the link
http://prntscr.com/dnfj2j This post was last edited by Glyrin at 2016-12-24 15:03 This post was last edited by Glyrin at 2016-12-24 15:03