I'm not convinced the units in panel 4 are safe or that the worst isnt yet to come. The first 3 panels are all atop the volcano which is just seeping lava up from below. Panel 4 includes what would seem to be a fresh explosion as lava bursts from the side of the volcano. The whole side of the volcano may be about to let go, and its facing towards those troops. Anyone who remembers Mount Saint Helens knows what that means...