The second launch acts as a block brake, if the computer thinks the next section isn't clear then it'll stop the train there. Despite being short the second launch straight can accelerate the train fast enough to clear the second half of the circuit. All double launch coasters have this feature, it's just very rare to see it!
Thanks streetmagix, of course it does, not sure why I forgot that when I’ve seen it launch a train up launch 1 while there is still a train meandering the second half after launch 2 so many times, I’m an idiot sometimes
(most of the time)