As far as i know, a quick open revers in quickstep is a fallaway reverse in watz (ISTD gold level).
Cuban Rumba, basic step:
left foot forward on 2
right foot in place on 3
LF to the side and slightly bwd on 4&1
RF bwd on 2
LF in place on 3...
It's not possible not to rotate at all on the first two steps since you start facing/backing diagonally to the center/wall before the first step, but...
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