Extract from my eCopy of The Microscopic Giants:-
A message of haste? I think so. For the one
picked up Belmont again, and all three stepped
into the concrete. I saw them forge slowly ahead
through it. And I saw Belmont, at arm’s length of
the little man who dragged him, flatten against the
smooth side of the stuff.
I think I went a little mad, then, as I
understood at last just what had happened.
The little men had killed Belmont as a
specimen, just as a man might kill a rare insect.
They wanted to take him back to their own deep
realms and study him. And they were trying to
drag him through the solid concrete.
It offered only normal resistance to their own compacted
tons of weight, and it didn’t occur to them that it
would to Belmont’s body.
I flung myself at the wall and clawed at it with
my left hand. The body of my friend was
suspended there, flattened against it as the little
man within tried to make solid matter go through
solid matter, ignorant of the limitations of the laws
of physics as we of earth’s surface know them.