So Tchort can be wrestled with (pretty amusing), but despite the Wrestled debuff applied Opportunist does not trigger, same with Psycho-temporal Dilation. Suppressive Fire triggers Opportunist just fine however, and so do Mental Breakdown and Stasis.
I thought that due to the eye itself being immovable it likely doesn’t have any MP, leading to the applied slow failing to register somehow, yet since Suppressed debuff very much counts toward activating Opportunist I’m sort of at a loss. At any rate, it would be reasonable if Opportunist triggered uniformly against Tchort debuffed by any applicable slow, or if Tchort were to be immune to being slowed in general as the eye neither moves nor acts to begin with.