At the spawn point, I had an alarmed Underfoot elemental spawn. A few seconds later, he turns and attacks me without travelling. However, I was able to harvest the stone at 1724.97, -123.29, 3546.79.
The alarmed one spawns if you get too close to them. Happened to me on Antonia Bayle as soon as it spawned because the lag reported me at a different position to where I was. >_<