[ They may be even now but Spike still feels indebted. Sure, he has friends now, a healthy emotional life even but before all that there was Tyki, who snatched the chip out of his skull and watched over him as he recovered and drank and played cards and had fun. Tyki who was his friend before he was neutered and housebroken and palatable. You don't forget that.
He takes another mouthful of blood, shakes out a cigarette from his pack before offering it to Tyki. ]