Was there a time when someone choked from the mochi? Or a time where someone was allergic to it?
There have been failures in the past, yes. I quickly found out that using mochi isn't as effective as chaining them, as the person affected are just mindless zombies. And even then people have preferences or allergies as you said. It isn't really a convenient method.
Thankfully, the prior person did not remember what transpired. So I left him to let him continue life as normal.