In the movie Stargate: Continuum, is there an in-universe explanation about why and when Ba'al's failsafe plan was triggered, and why there was a delayed timeline ripple as individuals disappeared at slightly different times? It's been a while since I've seen it, but I believe Vala Mal Doran disappeared first, followed by Teal'c, followed by others at the ceremony. Even if my memory is faulty about Vala going before Teal'c, the other SG-1 members don't disappear, allowing them time to escape through the Stargate.
Obviously, from an external plot-driven perspective, it is more dramatic to have sequential disappearances, and there wouldn't have been a story if the other SG-1 members had also vanished, but is there a canonical, in-universe reason? Also, how did the original Ba'al know that it was time to trigger his failsafe plan and when did he initiate it—before the ceremony, after the team and Jack O'Neill gated in, or at some subsequent point? I can accept the concept that a time change might propagate at a finite speed through the timeline, but Vala, Teal'c and the rest of SG-1 shared the same frame of reference in the timeline and, as far as I can tell, everyone should have disappeared together.