[Edward Teach]

What you all seem to be forgetting is one rather important detail:
The fact that the police were called in the first place, meant that he was acting in such a way that the people at the house didn't think they would be able to contain him or calm him down.

You have a cop who sees what he thinks is his partner about to get stabbed. What would you have him do?

[TigersEye]

I think the rational answers have been given over and over again. Grab the wheel chair by the handles and pull it back. Subdue his one arm. Apparently you don’t do rational.