What did Anna Beth say after Percy cut off the hydra's head in Percy Jackson and The Lighting Thief?

After Percy cut off the Hydra's head in "The Lightning Thief," Annabeth expressed her disbelief and concern about the creature's ability to regenerate more heads. She emphasized the need to be cautious, explaining that they had to act quickly to prevent the heads from multiplying. This moment highlighted her strategic thinking and knowledge of mythical creatures, showcasing her role as a crucial ally in their quest.