“The Undertaker shared a revealing anecdote about a heated exchange with fellow WWE Hall of Famer Koko B. Ware following the delivery of his first Tombstone Piledriver during the 1990 Survivor Series event.
Reflecting on his debut at Survivor Series 1990 during an episode of Six Feet Under With Mark Calaway, The Undertaker highlighted the carefully crafted nature of the match, designed to showcase his abilities and elevate his persona. Notably, the match featured Undertaker executing his inaugural Tombstone Piledriver on Koko B. Ware, marking a pivotal moment for both wrestlers.
However, the aftermath of the match took an unexpected turn as Koko confronted Undertaker in the hallway, expressing dissatisfaction and stressing the importance of protecting fellow wrestlers during high-impact manoeuvres. Undertaker, expressing genuine remorse, reiterated his commitment to the safety of his co-performers.”
https://tjrwrestling.net/news/the-undertaker-reveals-which-wwe-hall-of-famer-complained-he-injured-them/#:~:text=The%20Undertaker%20shared,his%20co%2Dperformers.