It may have sounded as though I were joking, worldofmantis, but I was making a serious point designed specifically to forestall a post like yours.
At best, yours is a classic
post hoc argument (" it died after eating a cricket, therefore its death was caused by eating a cricket"). If it had died after eating a fly, would you then have blamed the fly? Most of my mantids' unaccountable deaths occur after the victim has eaten a fly, because that is what I mostly feed them, hardly a good argument for "death by fly." Since it is safe to assume that "lectric's other mantids survived after eating mantids from the same batch (true Dave?) this one would have had to carry some unknown, unidentified, lethal disease that no one knows about. Substitute "magical spell" for "disease" and you get exactly the same result. How does that help? At worst, your argument will discourage new members from feeding crix, an excellent and easily obtainable form of food, and restart the "pro vs anti cricket wars"