An arrow has suddely dropped from the sky and...

[Jazzepi]

You can throw other cheap indy commanders (scouts, etc) in there who will dilute the chances of a crone being picked.

You can also moves your crones out of your capital and scatter them to other labs.

You can research forest/air dome to protect you from the arrows.

You can cast gift of health to give your crones enough hit points to survive the arrow attacks.

Jazzepi