The 3rd stage of the annual John Van Caneghem Tournament (2007).

Question regarding point 7 of the rules.
"7. It is forbidden to: buy back your dismissed heroes on the same day (i.e., use the "dismissal-buyback" tactic);
it is also forbidden to buy heroes who died in battle (do not confuse with those who fled)!"
- What is the purpose of "buying back your dismissed heroes on the same day"? What is the point?
- "It is forbidden to buy heroes who died in battle," does this mean you can't buy them on the same day, or not at all?