Hillary appeared confused and lethargic staring at the crowd BEFORE the protesters called out. The protesters are what made her snap out if it. She was reaching for something on the podium, the SS GUY got to her quickly and took something from her left hand. He then assured he they were there for her, it’s ok and KEEP TALKING. Then she came up with the really bizarre comment about “Trump and his kids kill lots of animals.”
I think what this incident may also illustrate is the fact that Hillary does not think well on her feet. All of her appearances are tightly scripted and controlled. Being confronted by these protesters wasn't in the script, so she became flustered and blurted out that ridiculous line and "Trump and his kids killing a lot of animals." The line didn't make any sense, and I think most of the crowd knew it.