Stuck in contaminated atmosphere on landing?
Would it not be wiser to disembark passengers immediately rather than waiting for an emergency response team?
Unless the team have kit to check for contagious bugs why leave those who are so far unaffected to sit on the plane and possibly be further affected?
If the cause is unknown who is to know that landing and switching engines off could have exacerbated the cause?
Perhaps it is a case of with the best intentions, sticking to an emergency response plan that doesn't quite fit the circumstances?
Mickjoebill