History of Cannonball!

Cannonball! is a Crucible medal triumph: defeat at least two opponents with Thundercrash after flying more than five seconds.

How to complete

1. Play Titan with the Striker Super Thundercrash.
2. Activate it from high ground or with height, keep flying for over five seconds before impact, and land on a group so the detonation kills two or more players.
3. Players on Bungie forums report struggling to reach a true five-second flight; a long open map and a high start help. The sources do not give a confirmed best map.

Notes

Thundercrash detonation damage was raised in a later update (3,200 to 3,900), which may make the double kill easier.