She was psychotic -don't tell Lookout, though- so that can hardly be called a rage. More fear, I'd say.
Freddie was in fear throughout the incidence ...
So he must have been experiencing it as anger coming from Sheila ...
He supplied her with cocaine ...
Most cocaine addicts go into fits of rage at times anyway ...
Even Julie probably did as well when hers ran out ...
its normally the day after the rages start ....