Flentak arrived on the Excalibur with Nix. Due to the belief that even verbal contact in another race's language is unclean, Apriori Flentak would not speak, and instead had Nix speak and translate for him.
Flentak and Nix had traveled to the Excalibur so that they could capture Natchok Var, who was a fugitive holding onto unspecified Moradi secrets. Var allowed Matthew Gideon to copy the data crystals before being taken into custody by Nix and Flentak.
Both of them allowed Var to travel on his own shuttle, which was promptly destroyed en-route to their ship.