When he injects it ( off - camera ) , it turns into a sabretooth ( off - camera ) and escapes .
Harkness then notices that one of the lab cats starts to yowl whenever it sees a syringe .
When Harkness injects it ( off - camera ) , it turns into a sabretooth ( off - camera ) and escapes .
Harkness then notices that one of the lab cats starts to yowl whenever it sees a syringe .