Example 1: You use Vengeance of the Dead on a land with many Towns which have each taken 1 Damage. If a Dahan dies there, Vengeance of the Dead will trigger and deal 1 damage (destroying a Town), but will not trigger further because it can't trigger itself.
Example 2: Same situation, but you've used Vengeance of the Dead
twice via a Repeat. This sets up
two triggered actions, call them A and B. If a Dahan dies there, trigger A will go off, destroying a Town (triggering B, destroying a Town), then trigger B will go off, destroying a Town (triggering A, destroying a Town). Neither branch can go further because triggers cannot trigger themselves, even indirectly.
(Discussion elsewhere) Tags: Repeat, Triggered Actions, Vengeance of the Dead