[macman104]

I am working on the delepine reaction which is attached.  I know after hydrolysis with ethanolic hydrochloric acid, I will end up with the primary allylic amine and then the text says that I will generate NH₄Cl and formaldehyde (which will be in the acetal form with ethanol).

I know the first step is an S_N2 attack of the carbon and displacement of the bromide.  This generates our first tertiary nitrogen.  In searching for a mechanism, I found one for the reaction of phenol with hexamine (I believe it was to add a CH₂ although I'm not sure).  The mechanism used for the phenol reaction is below, but applying that mechanism to my hydrolysis leaves me an issue at the end which I'm not sure how to resolve.

How do I go about removing the hexamine group and breaking it down into the formaldehyde and Ammounium chloride salt?