Whenever a component of a skill has a chance of Echoing, it means that it has a chance to trigger again immediately. This can repeat multiple times until the chance fails.
Here are two examples:
1) Deals very low Fire damage to all enemies. Has the chance of Echoing. Applies Ignite to all enemies. Applies Burn to all enemies. Requires cooldown.
Here, echoing is applied on the damage dealing. It may deal the damage again, in the same turn (so, uninterrupted by Anticipation) a number of times, until the chance fails.
2) Applies Injury to one enemy. Has the chance of Echoing. Deals moderate Physical damage to one enemy. Requires cooldown.
Here, Injury has a chance of echoing, which can be applied again once or more times, stacking on the target until the chance fails.
⚠️ Remember that Echoes can't be interrupted by Anticipation. They don't consume neither Stamina nor turns, since every Echo is triggered by one single skill.