When you declare an attack in THG
Is it directed at a particular player? Or their team as a whole?
Can you block any creature that's attacking your team?
You declare attackers and blockers as a team. Any opponent's creature can block any of your or your ally's creatures assuming it's a legal block.
In some cases you need to declare what player your attacking though.. Cards like {Spear of Heliod} and {Tromokratis} on the battlefield require you choose a player..
810.7b Any one-shot effect that refers to the "defending player" refers to one specific defending player, not to both of the defending players. The controller of the effect chooses which one the spell or ability refers to at the time the effect is applied. The same is true for any one-shot effect that refers to the "attacking player."
Any characteristic-defining ability that refers to the "defending player" refers to one specific defending player, not to both of the defending players. The controller of the object with the characteristic-defining ability chooses which one the ability refers to at the time the nonactive players become defending players.
810.7f As the combat damage step begins, the active team announces how each attacking creature will assign its combat damage. If an attacking creature would assign combat damage to the defending team, the active team chooses only one of the defending players for that creature to assign its combat damage to. Then the defending team announces how each blocking creature will assign its combat damage. See rule 510.1.
Just to back up what I said