[Susan nods and accepts her statements. Obviously, Kaoru wouldn't be willing to be labeled as having done such a thing.]

I understand, of course, and I... like you, shall accept the blame if I mislead the others into a wrongful death. The only thing is... that I know you to be a most meticulous and reliable person. Perhaps it's ironic that this is why I suspect you now.

What you say is possible. It is also perfectly possible that the poisoner did not target anyone in particular - neither Beat nor May. Simply the first person to drink from the cup and the first person to approach them.