Those theoretical are so outrageous that you won't ever see such a thing in actual game.
Do you have any screen shots of a 10k crash shot in any actual in-game situation?
You are far more likely to use something like Blaze (on something that doesn't have advance heavy stander), and doing thousands of damage with combat wand+knockdown than getting close to that kind of setup.
Very true. Not to mention that fullswing + support shot can deal almost as much damage while being significantly less complicated.
...Although I did forget to include Cry of the Battlefield's +30% bonus *wonders if 100k damage is possible*
If you can obtain around 300 ranged damage,
300 x crit x campfire x 900% frago
300 x crit x 1500% frago
Those should yield over 10k damage and both are plausible. 300 max damage isn't all that ridiculous.
Honestly though, this skill is extremely practical when paired with magnum shot and the fact that the splash doesn't cause agro is just awesome. It's going to completely replace thunder, at least while rafting.
15 mana/stamina per tyvm.