Whenever Torrent Elemental attacks, tap all creatures defending player controls.
: Put Torrent Elemental from exile onto the battlefield tapped. Activate this ability only any time you could cast a sorcery.
11/24/2014 “Defending player” refers to the player Torrent Elemental is attacking or the controller of the planeswalker Torrent Elemental is attacking. In multiplayer formats that allow attacking multiple players, creatures controlled by other players won’t be tapped, even if you control other creatures attacking those players or planeswalkers those players control.