During Part 2 of Watership Down, what are two incidents where Fiver uses his powers of premonition?
One example in Part 2 comes when Fiver predicts that Kehaar, the seagull, will return with information about available female rabbits in the area:
"He will return," said Fiver unhesitatingly.
"And what will he bring with him?"
"How can I tell?" replied Fiver. But later, when they were underground, silent and drowsy, he said suddenly, "The gifts of El-ahrairah. Trickery; great danger; and blessing for the warren."
His prediction comes true; while Kehaar returns with information about a farm and another warren, the consequences are that Hazel's warren becomes in great danger, first from the farm's cats and humans, and then from General Woundwort's warren. However, they are also able to steal does from the farm, resulting in "blessings" as they are now able to bear young.
Another example comes after the raid on the farm, when Hazel is shot and wounded; Fiver has a long dream where he talks with a farmer who is trying to get Hazel out of the drain where he has hidden:
...the shadowy, limping rabbit disappeared in the first light of morning on the down. Where was that rabbit now? Where had it gone? He began to follow it among the tangled paths of his own thoughts...
(Adams, Watership Down, Google Books)
In this case, he has a vision of Hazel lying wounded and unable to escape, with death looming over in the metaphorical form of the farmer. With this knowledge, Fiver is able to lead Blackberry to the drain hole where they find Hazel. Since Hazel's leadership is of vital importance, especially now that they are aware of General Woundwort and his animosity to other warrens, they take the risk of rescuing Hazel, who heals and leads the rabbits to victory.