Thinking too hard

Mark McJohn and Phil were sitting across from each other in the
security offices.
"Quite frankly, I'm still stunned by it all," McJohn said as he
rubbed his forehead in a manner which looked thoughtful but had more
to do with the two severe blows to the head he had recently sustained
than any effort on his part to look intelligent. "There must be
something that adds up about it all," he continued.
"Apart from everyone who meets this killer ending up violently dead,
nothing so far as I can see," Phil replied grimly, "and whatever it
is, it doesn't show up on the security scanners."
"Where's it been so far?" McJohn asked, pulling out a map of the
Dwarf as well as a black felt tip marker.
"Well," Phil began, looking at the map and pointing as he went
through the sad tally of deaths, "Efof was killed in Parrots, Mini-
Phil in a corridor near Parrots, Harris in that lift shaft there, and
Alota, Zodar and Canazza in the after thruster section."
McJohn drew a large black point at each location, then squinted at
the map, drew connecting lines with his fingers, then threw the pen
across the room.
"Nothing!" McJohn spat, "I might as well scribble this map full of
rude words, it'd accomplish as much!"
McJohn walked out the door before Phil could reply, then turned up
one of the corridors. He saw a figure in the distance coming towards
him. He recognized it.
"Hey --" he didn't finish, since the figure knocked him off his feet
with a single punch. McJohn fell to the floor and the figure stood
over him as he looked up, dazed. It bent down towards him.
"Sorry McJohn," said Dante.
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