Outside the hour glass, rotschreck and disarm

Kraus wrote:

I'd much prefer "pending"

So do I.

Non-existant user wrote:

Siren's Lure does not seem to belong there: the window to play it is different and the trigger is different: it makes sense for effects due after combat to vanish if combat does not end because their window closes, but there will always be an end of action after all possible Psyche, Form of Mist,... have been played.

You can't play Siren's Lure if there's already a pending combat. The most common case is when, during the same action, you'd like to make two block attempts fail with two Siren's Lure.
The idea is to flag any card creating a pending combat.
Siren's Lure interacts with Psyche! for instance. If the acting vampire A is blocked by the vampire C after B's attempt has been foiled by a Siren's Lure, C can't play Psyche! because there's already a pending combat between A and B.

The proposed card texts are not official, though it leads to the same behavior as with the rulings.
The Siren's Lure ruling has been official for quite a long time now.