It doesnt work that medley they are doing.
Also firth of fifth just starting with the drums is pretty lame too.
I think that right after the acoustic section, instead of playing Duchess,
they could suddendly fill the arena with the atmospheric intro of WATCHER OF THE SKIES (only the intro),
continuing with FIRTH OF FIFTH + I KNOW WHAT I LIKE as they do now.
Next piece could have been DUCHESS.
I think that variation would have been simple to do but very impressive and friendly with old fans.