If you attack with your “Mother Grizzly” and it is destroyed as a result of battle, you may attack with the monster Special Summoned by “Mother Grizzly” before entering Main Phase 2.
If your opponent controls your “Mother Grizzly” and it is destroyed as a result of battle, you get the effect of “Mother Grizzly” NOT your opponent.
Since the Special Summoning occurs during the Damage Step, “Torrential Tribute”, etc. cannot be used.