Was the Teacher Who Propped-Open the Back-Door at Uvalde School Complicit in Mass Murder What’s the Reason?

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Reportedly a school teacher propped-open a backdoor at the school in Uvalde at 11:27 am, only about ten minutes before the mass murderer entered the school through that door, and about five minutes after he’d fired at the people at the funeral home nearby after he wrecked his car, so what in the world motivated that teacher to prop-open that door in the first place, even more odd that the school should have been alerted about the shooter after he’d shot his grandmother and at the people at the funeral home, so who is that teacher anyway, what was his/her motivation for propping the door open?