Where was the Secret Service?
One of the pictures shows 2 secret service agents to the left and her right. This person was able to touch Trump a couple times.
It shows at least one of the secret service agents reaching out towards her.
She obviously closer to Trump than was allowed.
The Secret Service agent seemed distracted by Field’s friend whom was wearing a plaid jacket-—perhaps this was a gambit to allow her to pursue Trump.
The older footage taken from a position directly to the left of Trump, shows the agent facing plaid-man. At that moment Lewandowski perceives motion behind Trump. Lewandowski moves oblique-right placing himself between Fields and Trump, possibly having seen something grasped in Field’s left hand.
The agent has also realized something is in play, and arrives behind Field’s position slightly behind Lewandowski’s close approach between Fields and Trump.