Here’s the official line on it from John Lewis. The son had felt distant from his father lately (obviously according to this thread this never ever happens with teenage boys, it’s not even a thing and if does it’s your fault as a parent).
The son is finding a way to reconnect with his father. The dancefloor becomes a metaphor for memory, connection and unconditional love…exactly as many of us assumed.
But yes they probably needed to spell all this out for some people.
No abuse or menacing behaviour.