Blind rage medal requirements

[Metathron]

Aren't the requirements for level 3 (21,000 rage used) a tad much? I mean I'm playing as a warrior and have been relying heavily on rage, casting fiery phantoms or lava call whenever possible, and I have used "only" 18,000 rage so far.

One possible explanation I can think of is that this is so on account of playing on normal, where battles end sooner than on hard or impossible, where maybe twice as much rage would be used.