Snakes, Trains, and Digimon - S1.E15

Takato is depressed after Henry and Rika have previous commitments and can't go Digimon patrolling, but he feels better when he goes with Guilmon to play with his school friends. But soon the snake deva Digimon attacks, leaving Rika and Henry to fight it on their own, until Impmon helps out and tells Takato they need him. Guilmon and Takato join the battle and Guilmon digivolves to Growlmon. After a short battle, Growlmon mortally wounds Sandiramon with an extra powerful Pyro Blaster, but Sandiramon warns that there's ten more Devas that will be coming before succumbing to his wounds and dying.