Re: Only in Hero ID
In 5e, having the 'only in Hero ID' limitation requires that there be some way to prevent the character from entering his Heroic Identity. He has to say a magic word, or manipulate a device, or something, so if he can't do that for whatever reason, he can't access those powers.
For example, IMHO, Thor/Donald Blake was Hero ID; he had to tap his cane on the ground to become Thor. No cane, or nothing to tap against (say, floating in a zero G chamber away from the walls), or tied up, no turning into Thor. If Billy Batson is gagged or in a silence field, he can't say 'Shazam' to turn into Captain Marvel. Compare/Contrast Colossus, who armors up with just a thought; he doesn't have Hero ID, he just activates his Density Increase and Armor.