They (the cowherd boys) looked at the beautiful face of Krsna, the enemy of Bakasura, and, laughing loudly and clapping their hands, they entered the mouth of the python - SB 10.12.24

Expressions researched:
"they looked at the beautiful face of Kṛṣṇa, the enemy of Bakāsura, and, laughing loudly and clapping their hands, they entered the mouth of the python"

Srimad-Bhagavatam

SB Canto 10.1 to 10.13

Then the boys said, "Has this living creature come to swallow us? If he does so, he will immediately be killed like Bakāsura, without delay." Thus they looked at the beautiful face of Kṛṣṇa, the enemy of Bakāsura, and, laughing loudly and clapping their hands, they entered the mouth of the python.

SB 10.12.24, Translation and Purport

Then the boys said, "Has this living creature come to swallow us? If he does so, he will immediately be killed like Bakāsura, without delay." Thus they looked at the beautiful face of Kṛṣṇa, the enemy of Bakāsura, and, laughing loudly and clapping their hands, they entered the mouth of the python.

After talking about the terrible animal this way and that way, they decided to enter the demon's mouth. They had full faith in Kṛṣṇa because they had experienced how Kṛṣṇa had saved them from the mouth of Bakāsura. Now, here was another asura, Aghāsura. Therefore, they wanted to enjoy the sport of entering the demon's mouth and being saved by Kṛṣṇa, the enemy of Bakāsura.