Rearcrew restraint - intertial reel harness

[PPRuNeUser0211]

Just watching some local news coverage of flood relief and the rear crew in a local mil helicopter seem to be attached to the cabin via an intertial reel system. Never seen that used anywhere else aside from for some "work at height" PPE, anyone got any experience of using something similar in a helicopter cabin? Where it's seen free-hanging looks like a really big grabbit hook on the RHS of the picture.
https://cimg3.ibsrv.net/gimg/pprune.org-vbulletin/1599x900/z20_interior_inertial_reel_restraint_4_jul_21_9409344970df0b e5647113978b753e69a21702d7.jpg
https://cimg4.ibsrv.net/gimg/pprune.org-vbulletin/1600x900/z20_interior_inertial_reel_restraint_3_jul_21_0bdb10dff5da23 3b537d0eae10d6ee85453dffc0.jpg
https://cimg5.ibsrv.net/gimg/pprune.org-vbulletin/1600x900/z20_interior_inertial_reel_restraint_2_jul_21_bdc37c02890a6f 87c1e8451c8fdbd65b15ae99c5.jpg

[212man]

aside from for some "work at height" PPE
That’s exactly what it looks like to me.

[lowfat]

looks perfectly adequate to me. if it stops you falling out its all good