At the end of Skybound Vol. 2

So I've been reading (and re-reading) the first two volumes with my kid and last night he asked me for clarification on the end with Optimus and blowing up the Energon harvested from Earth, the severed piece of Cubertron falling into the ocean and Beachcomber saving him.

I got most of it to his satisfaction but with Beachcomber... was he surfing the connecting beam between Earth and Cybertron that I guess was sucking up ocean? Then when Prime cuts the connection abruptly Beach sees Optimus falling through the atmosphere while surfing the falling ocean water back down to Earth on his powered board?

No spoilers for Vol 3 if possible. We're really digging these.