more ... (interesting!
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Origin of SIC

Latin, so, thus — more at so

First Known Use: circa 1859
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From Merriam Webster online --
(http://www.merriam-webster.com/dictionary/sic)
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1
sic
\ˈsik\
Definition of SIC

chiefly Scottish variant of such

2
sic
transitive verb \ˈsik\
: to attack (someone or something)
sicced also sicked \ˈsikt\ sic·cing also sick·ing
Full Definition of SIC

(i)
: chase, attack —usually used as a command especially to a dog

It stands to reason that the Latin "sic" meaning "thus" as in "so" is the origin of the active verb for chase or seek, noted as the origin above. "Sic semper tyrannis" and "Sic transit gloria mundae" come to mind. "Thus always to tyrants" & "Thus passes or so goes the glory of the world"
Make sense?
Prof H