Reconfigure
Cooldown: 12 seconds
Switch between weapon configurations.
A-36 Tactical Grenade
Cooldown: 8 seconds
Fire a bomb that bounces off walls and explodes when it hits enemies or the ground.
Configuration: Artillery (Ultimate)
Needs to be charged
Become immobile and fire up to three powerful artillery shells.
In case the video won't load here's the external link.
A Guide for the Hero Bastion from Overwatch
The narrator talks about the hero generally then summarizies it's abilities and how you can use the effectively in the most precise but shortest way. In the background there are clips from the game, possibly it's the narrator's gameplay. He talks about against which heroes can and can't be this specific hero be used.