Retro Magnifying Glass

Note: The leash is a virus, not blood. The 'Blood drop' as many people see it is the head of the virus, the body is below connecting to the long jointed legs at the bottom.

Viruses come in many shapes and forums, but the one in game has this shape: http://en.wikipedia.org/wiki/File:Phage_injecting_its_genome_into_bacteria.svg

The leash is also named 'Magnifying Glass' according to many people, and supported by the fact that the owner has been seen holding a magnifying glass.