TPG.Rush.BeginBreak

Open the skirmish gap before the next stage. Takes the point off the map first, through SpawnAll with an empty list -- the same call that would spawn one, so there is a single path by which objectives come and go. That removal IS the break: with nothing placed, there is nowhere to pre-position, and the next point is news when it lands rather than a destination people have been driving to for five minutes. A break of zero or less is not an error, it is the old behaviour, and it reveals the next stage immediately rather than leaving the map empty for a tick.