If this is really just to address a specific problem for Meteor Shower then I think making a command just to auto-kill is too harsh. Something like maybe gradual HP/AP loss or even just an alert that exposes their location while standing still for x seconds so they can be aimed would be better imo.

I don't think it's worth the time to make a command just to benefit one or a couple of events. A solution that can also be used for other events or even lead to potentially new event ideas would be best imo.