I get that part, it’s still the reaction I can’t wrap my head around mainly because I don’t understand how chemistry is any different than alchemy.

I know that lithium itself doesnt fuse to create He+T+D, and I know it can’t undergo fission. Since lithium isn’t left over, and lithium-6 and 7 are stable, does that me the neutron with extremely high kinetic energy really knocks like two of the LiD mokecules into each other, causing dueterium -dueterium fusion resulting in He4, and the Li6 gets more neutrons that for it to be come unstable enough to decay into tritium or deuterium?