Aligning riot shields (duration of shield bonus)

[HammerJack]

Knight shields and tactical shields both state that you can align the shield against an opponent to gain an increased bonus to AC against that target until the start of you next turn.

Riot shields state that you can align the shield against a target as a move actiom, to activate special shield mods. At higher levels of riot shield, you also gain increased AC bonus against that target.

The rules on aligning a riot shield do not include any duration for the effects.

Am I correct that this an error, or are riot shields actually intended to remain aligned without further move actions?

[Corsair17]

I hope they will rule that the shield stays aligned. I have used and taught riot shield use and once you "lock on" it is, not easy, but can be done almost reflexively with practice.

[Lethallin]

It would certainly make Riot shields a lot more appealing.