Would be pretty strange for them to have an identical rage mechanic for all the outside Delve NM's and then a completely different one for the Delve Bosses.
Plus our Muyingwa practice run was no different to our win. You would have expected our practice timeout run to have raged since we used all available time except it didn't. There was zero difference to our winning run apart from we did less damage (less damage purely because of us and not because of anything the mob did)
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