Notice how the mug-skull gets eye contact with the Lurker in the second panel :) It seems Leo (and other inhabitants of Gary’s mansion) are oblivious of the Lurker’s existence.
On another note, it is a bit strange for Leo to have such a surface-to-air weapon in the basement – i’d expect him to go upstairs and install it in the attic.
Notice how the mug-skull gets eye contact with the Lurker in the second panel :) It seems Leo (and other inhabitants of Gary’s mansion) are oblivious of the Lurker’s existence.
On another note, it is a bit strange for Leo to have such a surface-to-air weapon in the basement – i’d expect him to go upstairs and install it in the attic.