Who knows? In a crisis, sometimes the ability to act fast enough or think straight leaves you. Look what happened to EJ after all.
You can also see John in the GSC when Mr. Guggenheim and Mr. Giglio make their famous announcement. The scene was cut in length in the end, but can be seen on James Cameron's Titanic Explorer. John and Ben have a brief conversation, shake hands and head their seperate ways. Have a look for him!