HALF ALL MOVEMENT - RM2K3

Really quick question... Why does "Halt All Movement" NOT halt all movement?

I need all moving events to stop for the time a certain load of test is displayed. I thought that halt all movement would do what it said on the tin.. It even says in the help file that it "HALTS ALL MOVEMENT".

Is there an easy alternative? I'm doing some back-tracking development-wise and don't want to mess with an otherwise perfectly sorted-out map too much. :/

EDIT - Title fail :/