Dredh red spells don’t work properly and that’s was started after temple raid event started. When battle started everything good but after whirlpool spell press and use them both red spells didn’t work and show them like you don’t have rage. And anyway if you have full rage bar or not red spells don’t work till dragon died.Only can use them before use whirlpool spell.
Many posts about this already, and it has been fixed in 5.08 as well. Try using the search before posting next time!
Spells should be fixed in version 5.08, which has been released already (at least for apple devices).