So as the weapon associated with this loadout has yet to be released, this is JUST speculation based off of my explosher experience. Played like a backliner, the explosher gets kills by getting the drop on opponents. Find the high ground and defend it. Utalize the ledge by dropping down if you get ambushed, make sure you leave behind a present in the form of a point sensor, and if your teamates are nearby, will usually help you with them so long as you drop a this way too. Create a spot to get up, this will take one to two shots depending on the ledge. The radius of your blast is giant and does 35 damage. An extra 55 damage is granted to those who can connect the initial shot, the reason you are on the high ground us to connect both, as it's much easier to make those shots from above. If you get in a panic situation, use your special and hightail it outta there. Like I began with, this is only speculation as this weapon has yet to be released.
Weapons of "Prospective Custom explosher loadout"