well for me Zanshin is the "total control over a situation". Mentally and Physically.
In Kendo I also imagine a state of control about the others mind, body and life. Of course! Because, we are talking about swords, not bamboo sticks.
Anyhow Zanshin is also the same state as before the strike. You only have the chance to show your strike was not a lucky reaction or something similar. Seme and Zanshin are beginning and end at once. The state if your mind is important, not the point of time.
What is Zanshin for you??