The ending was perfect. After you hear the bell, right away you saw Tony’s perspective, and the “black” was Tony’s perspective after Members Only guy shot him.
“The ending was perfect“
Assisting the perfection was that the sudden nothing referenced a conversation Tony had with someone about assisting him in a hit about “what you think happens when the blast to the head comes?” If I recall Tony thought “one second you’re there the next you’re gone”.