It does happen to be Phalanx, but they're not waking up very quickly--or, at least not with any agile amount of sense as they're shoved and thrashed at. So, there is nothing to notice or help when all of their dead weight moves back from the demigod... and starts to pour over the edge of the couch.

Depending on how many limbs Robin has free and how much the two of them are still wrapped together in death-shrouds, one or both of them may be in for a surprise.