sulam bhaumo ’cyutam hantum
tad-visargat purvam eva
narakasya siro harih
Bhauma, frustrated in all his attempts, took up his trident to kill Lord Krsna. But even before he could release it, the Lord cut off his head with His razor-sharp cakra as the demon sat atop his elephant.
According to Srila Visvanatha Cakravarti, as Bhauma raised his invincible trident, Satyabhama, sitting on Garuda with the Lord, said to Krsna, “Kill him right away,” and Krsna did just that.