kinda surprised that we see Alan at this juncture looking all messed up, but considering that the curse MUST be affecting him right now, and what happened on 17.4, you have to wonder how it goes from here since in the WN ...
it would be the sage that comes by and kidnaps Ravi at this point in the series.
@Capt_Gigglepants:
Not sure about that.
My guess would be that a curse that is "dispelled" by the magic / skill Douglas used is not actually dispelled but removed from the original victim and sent back to caster.
If that is the case then the curse would have returned to Alan and would now work on him.
The other possibility would be that (like in many settings) spells (including curses) are connected to their casters as long as they are active.
In the case that a spell or a curse is interupted or dispelled that connection will cause a negative feedback to fall onto the caster that is equivalent to the original spell's / curse's power.
Therefore in this case the curse being cancelled by Douglas would have caused an equally destructive feedback onto Alan as a result.