For a safe release during power moves 5th line for sure.
Set up your unhooked bar with 5 lines.

The Wipika CLS bar is awesome.
Release is smoother and less pulling than other 5 line systems I have used.
Relaunch is the fastest.Think it is the 'adjustable stopper balls'
CLS has low friction, also a clear view through the bar.5th line doesnt pinch between
depower loop and the bar when unhooked.
Think the bars are real cheap now too.Dunno website was down last time I tried.