Turns out that the Sentry has taught some hard-learned lessons to X-Man Angel in the past…
The Angel see’s The Sentry up in the sky and is forced to remember previous encounters with the Sentry and the lessons he had learned from him. He recalls an early adventure when the X-Men and the Sentry teamed up against the mad evil of the General. It was a time when the Sentry teaches him an important lesson in being a superhero, the well being of others should come before one’s own well being.
— Description from Comic Vine community (comicvine.gamespot.com).
