Definitely Catwalks for evac, its an airtime hill before the spike, so in the eventuality that it clears the hill but valleys in-between that and the spike they need quick way to get people off - the alternative is calling the fire brigade to do it for them. Someone posted some silly theory that the side anchor points are for a canopy to provide shade for the LSMs - when cooling options exist on all the other intamin LSMs that sit in sunlight.