Not that WESS has any reports on that incident, but I thought it was a courtyard wall higher than expected/modeled during mock assaults - not VRS.I'm not too familiar with many instances of VRS in H-60s other than the loss of the super secret H-60 during the Bin Laden raid.
The longtime civilian instructors at TPS say VRS is very difficult to induce in the H-60, and our rule-of-thumb NATOPS limits are VERY conservative.
An interesting fact about VRS: the lighter you are, the easier it is to get into VRS (i.e., lower descent rate). So, if it's difficult to get a 15k-lb TPS UH-60L into VRS, it takes even higher descent rates to get a 23k-lb MH-60R into it. (Not that I'm recommending any newly minted HACs attempt descending 1,500 fpm at 20 KIAS)