In the prologue, I'm telling the actions of an event that happened through the narrator's eyes and took place many moons ago. Is it okay to open using past tense, then immediately switching into present tense to tell the story as it unfolds - with occasional use of the past tense to keep it a balance. Or is it more proper to keep it all in a singular tense? I've typed this up as an example. I could see her screaming. Well, I think she was screaming, I couldn't hear her due to the windows being up on all the closed doors, with the sweaty palm on my left ear muting all noise except the muffled audio coming from the speakers, as my right ear is being pushed against the window so hard that I’m wondering why my head hasn’t already burst through the thin icy sheet of glass. She looked shocked, like a cheap haunted ghoul mask that’s only purpose is to be bought last minute on Halloween, with her twisted jaw frozen open, but her eyes showing no emotion magnified under those thick glasses. Any advice is appreciated.