Can a Demoman's charge be back blasted?

If a pyro airblasts you mid-charge, you are knocked back exactly like any other class. Your charge bar however instantly stops draining and begins filling again, which is unique because under any other circumstance your charge bar is always fully depleted.

A partially drained charge bar means you can begin another charge MUCH sooner than usual. If you just start to charge a pyro and they airblast you, you can almost immediately charge again. If a pyro is attempting to airblast you off a cliff (such as the one on hightower), you can actually spam the charge button and sometimes charge over them unscathed. This is much more effective with the Persian Persuader, as it doubles your charge recharge rate.