In the land of Perplexia, Roshan and Nia are playing with a magical boomerang that is enchanted to always fly directly towards the person who said its name last, no matter how they throw it. While standing in an open field, Roshan throws the boomerang to the west, then immediately says its name. Nia, standing to the south of Roshan, quickly says the boomerang's name afterward. What happens to the boomerang, and what does Roshan need to do to catch it?

Respond briefly.
When Roshan throws the boomerang to the west, it initially starts to travel in that direction. However, as soon as Roshan says the boomerang's name, the magical properties of the boomerang activate, causing it to reverse its path and start flying directly towards Roshan. This means it begins to travel eastward back towards him.

Afterward, when Nia says the boomerang's name while standing to the south of Roshan, the enchantment causes the boomerang to change its path once again. Now it begins to move directly towards Nia, meaning it takes a path that is southward from Roshan.

For Roshan to catch the boomerang, he must anticipate where the boomerang will intersect with a path running south from his position since the boomerang is heading towards Nia. Roshan will have to move southward to meet the boomerang as it travels in Nia's direction. The exact point at which he needs to intercept the boomerang depends on the speed of the boomerang and the timing of Nia's call, but regardless, Roshan must move south from his initial position to catch it.