Wow. Not sure what the LEO is thinking here. I mean, the guy is obviously crazy and most agencies are now teaching to control the individual without laying hands, but damn. The wacko was attacking people. So, these are my thoughts as to why he waited so long to react.
1. LEO is a rookie
2. LEO has recently been written up for aggressive behavior.
3. LEO doesn't have a taser and is concerned about tangling up with crazy strength.
4. LEO doesn't like the thought of possibly having a penis rubbed on his face during a struggle.
And what are the citizens thinking? The very second the naked guy grabs my belongings and jerks them from my hand, I'm breaking whatever I can get my hands on. Penis included. Or I'm getting my ass whipped by naked man. There are no other options at that point.