Able to practice specific mechanic from savage/extreme

I would like QoL update where we can practice specific mechanic no matter is it extreme or savage.
Cause example I had problems with lions in ShB savage and I couldn't practice that mechanic at all cause it always took too long to get that part and when our static finally got it, we wiped.
I was confused what to do even when reading guides and watching them.
I just learn mechanics when I can practice them myself, so it would help a lot if we could just skip to something mechanic to practice it.