That bear warrior was well aware of the disparity between himself and the enemy before him. He had not hoped to perish with him. His intention was to use his own self-detonation to vie for some time, using the last bit of his strength to stall him for a while, so his comrades would be able to prepare themselves, so they could slay more enemies!
Using his own life, his own spirit, turning it into an explosive force, keeping this God of Death out! Even if it was just for a second, his sacrifice was worth it!
Perhaps it was because he managed to vie for this one second for his comrades, to allow them to have some time to prepare themselves!
Because a Saint Venerable like this, the damage he would cause the moment he landed in the concentrated troop of Heavenly Punishment warriors, would be destructive! There may be many comrades who would be killed, not even having the time to use the Heaven Reversal Pill!
