QF at the time I flew for them had "precautionary disembarkation"- basically, a need to disembark asap but where the risk of injury using slides is greatwer than the risk of the non normal/non standard event.
this was only ever to be done after a thorough PA to pax, outlining which doors were to be used (nominates by capt after briefing with cc) and whether steps or slides would be used. Usually the phrase was "due to an abnormal situation, as a PRECAUTION we require to disembark all passengers. At this time steps are/are not available (and slides will be used). Doors mentioned and demoed by crew. Leave all bags, proceed calmly, follow all crew instructions etc. CC would use downgraded version of commands in a normal "marshalling people" volume to the tune of "leave cabin baggage, walk quickly, take care on the stairs/sit down and slide"
at any time it could be upgraded to full evac if situation demanded it, by an announcement on the PA "evacuate evacuate evacuate" and corresponding commands by CC. E.g. "leave everything this way jump and slide/run and move away etc etc...
iirc they used this method in SIN with the wounded A380 once established that full evac was not necessary due presence of RFFS