In Mary Shelley's Frankenstein, how is Victor at the beginning of the first chapter in Volume 2?

At the end of Chapter Six, Volume One, of Mary Shelley's
Frankenstein, Victor has finally returned to the man he was before
he began his studies at the university in Ingolstadt—before he created the creature in
his laboratory. He is filled with laughter and
joy.

However, in the first chapter of
Volume Two, Victor receives a letter from his father in Geneva. It informs Victor of the
murder of his youngest brother, William, and Elizabeth's desolation at this loss. Victor
is filled with despair over this loss of his beautiful and loving sibling. In his agony,
he wants nothing more than to return home to be with his
family.

However, before Victor reaches Geneva, waylaid by
the closing of the town's gates at sundown, he comes upon a vision that makes all things
clear to him regarding William's death. In the midst of a raging thunderstorm, between
flashes of lightning, Victor sees the image of the monster he created walking on the
landscape before him. For only a moment he wonders at the creature's presence. In the
next instant, Victor is certain that it is the monster that has
killed his brother. The anguish of this knowledge is compounded only by the realization
that Victor is responsible for unleashing this villain upon the
world, who has now taken his brother's young life.

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Alas! I had turned loose into the world a
depraved wretch, whose delight was in carnage and misery; had he not murdered by
brother?...I considered the being whom I had cast among mankind, and endowed with the
will and power to effect purposes of horror, such as the deed which he had now done,
nearly in the light of my own vampire, my own spirit let loose from the grave, and
forced to destroy all that was dear to
me.