It is an elegant move: No fifty-cent bullet for him. Only the finest: One of the rarest materials around --polonium-210.
The event is pregnant with information.
1. In its rarity, the poison is extremely expensive. That makes it the tool only of the discerning assassin.
2. Its rarity proclaims its unnaturalness. "Hi. This was a hit. And a high-class one, at that."
3. This was the work of one man's direction. Such things are not decided by committee, but by men singular enough to dominate.
4. The impetus was not revenge. That is too base for such a considered method.
Beyond that, I cannot discern.
...Though I suspect the director has placed an undue value on 3-space energy. It is an inferior form, after all...
