One other thing they have commented on predictably is that this magma is VERY fluid. It's thick, but moving rapidly. Hence the reason for so much rapid deflation. If it did erupt, that stuff should be spilling out with any coagulation in the rift it opened up. It's not carrying large amounts of solid objects like some other volcanoes might because it's coming from so deep in the earth. And...one of the MOST telling pieces of evidence from this NOT being a true eruption...is pumaceous rock coming to the surface. Pumaceous earth is rare in a volcanic explosion. It becomes pumaceous, according to what I've read AFTER an eruption. The former eruption stalls, lava sets up, and then is sometimes squeezed or the basalt is washed out of the rock. The rock becomes VERY light weight and drifts easily with the current. It will nearly float at times it's so light. Underwater currents, explosive gases, etc., will launch it up to the seashore. There have been numerous photos coming out of Hierro's beaches, littered with pumaceous rock.