I think the vandals would have went out via Petgill Lake / Britannia roads. Gondola peeps would know right away when it's cut and would surely have blocked off Shannon Creek road and any of the other trails leading to the base, in the time it would have taken them to hike up or down.
Not necessarily. This was wee hours in the morning on weekend. Drive in Indian FSR, hike to tower, there are now trails there, cut and run. By the time alert happens they are long time gone. Britannia is option though. Regardless, they just need to catch this guy because they will keep doing it over and over.