Hunt Down — ruling 1

If the first creature targeted by Hunt Down can’t block the second targeted creature (for example, because the second creature has flying and the first doesn’t, or because both creatures are controlled by the same player), the ability does nothing and the first creature is free to block whichever creature its controller chooses, or block no creatures at all.

Hunt Down : règles, fonctionnement et interactions (MTG)

Hunt Down is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.

Official card text

Target creature blocks target creature this turn if able.

How it works : Hunt Down

Original English text — Wizards of the Coast / Scryfall

#1October 1, 2007· Wizards of the Coast
If the first creature targeted by Hunt Down can’t block the second targeted creature (for example, because the second creature has flying and the first doesn’t, or because both creatures are controlled by the same player), the ability does nothing and the first creature is free to block whichever creature its controller chooses, or block no creatures at all.
No other card is named in this ruling.