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Not going good.

Nappa does not have a tracker/scouter, the bald monkey does not know how to feel KI, and it is possible that this is one of the clones created by the Sanzoken technique. In these moments we understand that the advantage of being able to control is feeling the KI.

I can see that image when Nappa cuts Tien's arm of coming up But Roshi being smashed to a pulp instead

Kiwi says on the previous page that would Nappa kill only one, and leave the other to be interrogated. Probably Roshin will be killed, and yamcha will be too hurt to fight.

If Yamcha knew Kienzan, Master Roshi could use Bankoku Bikkuri Sho to paralyze Nappa, and Yamcha would cut him in half. In this situation Mestre Roshi had only MAFUBA as a last resort, but I don't think he would use it in Nappa, I believe he would save it for Kiwi, since he is the biggest threat on the battlefield.

The only flaw in this thery is that a Kienzan CANNOT kill (neither if aimed at the neck of a standing enemy from less than a meter) as stated during the fight against Raditz

No, my friend, LOOK AT THE ERROR, both in the manga and in the anime, Krillin's Kienzan cut Freeza, if he had taken the cold demon in his head or head, he would be doomed.

I know, I was referring to a joke rule explained by Salagir on DBM page 838 (and Chewie quoted that during the figt against Raditz C18 P27-28)

Nappa aint playing around anymore! Run Muten Roshi Saamaaaaa!