That may be the body going into fight-or-flight mode: adrenaline rising, blood pressure too. This can happen when a person is confronted with a threat and does not know what to do next, that will be effective.
I am reporting all of this
You may wish to create your dated documentation very carefully, so it is factual, unemotional, and refers to the 504 frequently.
Teacher One said, "I'm not emailing your mother back because this is YOUR responsibility."
If the 504 states she will respond to the parent via e-mail then she is not free to unilaterally change this requirement.
Teacher Two said, "You are losing points!" to DS (publicly) when DS blurted "hi" to a friend who had come to the front of the class to present. This teacher doesn't give any written feedback on the students' assignments--so I have no idea how many times DS has had grade reductions for behavioral issues.
You may wish to refer to what the 504 stipulates a teacher is to do regarding classroom behavior.
You may also wish to suggest the creation of a grading rubric if one is not already used for each assignment, to help reduce the incidence of grades being capriciously assigned, based on other spur-of-the-moment criteria.
