It Must Have Been the Tacos

Yeh - that undermines the overkill thing, though I think it would be good to lose one of those pronouns. Maybe 'Slapping open the door / he turns...' ?
But yes, I think it reads better that way.

I'm intrigued - you seem to avoid the use of certain punctuation characters (stops and commas), but embrace the use of others (speech marks, apostrophes). I presume that's a deliberate thing (?)