Does “Engage” in this instance even mean deadly force. What about this:
“Should USSS provide resistance or interfere with FBI timeline or accesses, FBI MM EM will engage with [redacted] and [redacted] will engage with USSS POC’s per existing liaison relationships.”
That seems to suggest something other than force.
What am I missing here?
You are not missing anything. Everyone running around screaming about an assassination attempt is missing something - reading comprehension.