Being pedantic here and the outcome was good but was it wise for the pax to stand on the wings?
In my opinion it was very wise. It would be a brave and possibly stupid Captain/First Officer/ Cabin Crew member who ordered pax into the river with a water temp of about 5 degrees C . Everyone involved would already be going into shock, some probably can't even swim. For a fit person the 'exhaustion time' is about 20mins at that temp and expected survival time of 30-90 mins. For a mix of ages, health levels, possibly injured pax it would have risked turning a very successful ditching into a tragedy.