Could've been a previous or in progress domestic situation is why granny was upset to start with. Those are dangerous for police to become involved in, because Fred might've come out shooting after seeing his wife being roughed up. Especially if the husband had been drinking and pissed off beforehand.
Sounds like in retrospect it might've been better for a rookie (which these men probably were) to call the precinct sargeant before doing anything.
Then if he said to arrest granny, the responsibilty would rest on his shoulders.
I can see if the policemen weren't in their car, and might've been investigating something, then granny paid the consequences honking at them to move. If they were in their car and could've easily moved to unblock a driveway or something, that may be different, provided granny wasn't under investigation to that point. Sounds like poor timing to me.
But you never know. Granny might've speeded down the street and had a wreck under this hypothetical situation.
I thought the voltage could be adjusted on Tasers. They don't have to deliver full power, and I don't believe that was the case here. Otherwise granny would have dropped like a sack of potatos and might have died. How do you know it wasn't the best way to do things? Use a billy club to start out and then administer a choke hold after getting granny on the ground? Karate, Jujitsu, Aikido or Judo perhaps? Are the officers trained in this? Granny might have had a knife or pencil hidden away. Grappling is too close for comfort.
I'd have to say there's not enough information about events leading up to the tasering, to reach any conclusions.
Other than:
66 ain't all that old, and granny was in relatively good shape to take a tasering and keep on resisting...assuming she wasn't on PCP.
Les