His misjudgment should not count as to wether killing a seemingly defenceless Sith is the Jedi way or not. That's all I'm saying. Besides, the only reason Anakin did save Palpy is because he needed him for himself, to save Padme. Anakin was not really there as a defender of the Jedi Way. He had selfish reasons to protect his very unJedi lifestyle.
Good, I was hoping you would continue this...
If he (OB1) could kill defenceless opponents...then he should have done it...not because he was a Sith...you are right, they were friends and Yoda had to talk him into it...but if you saw your closest friend (once again...this wasn't shown as told by you so it must be assumed), would you really let him lie there suffering...burning slowly to death, not able to do anything?
No, he would have gone up and taken a quick slash at the jugular or something, yes, sounds gruesome but it would be better than letting him suffer to death, why take the worse of two roads to get to the same destination?
OB1 thought he was going to die. But he couldn't do anything...because! he was defenceless!