1)
How did he swindle his friend?
1.
Rashi: He entices him from the ways of life to the ways of death.
2.
Malbim: First he swindles him and harms his property, and afterwards his body, and afterwards his Nefesh (just like the previous verse discussed one who inflicts monetary, bodily and lethal harm).
2)
Why does it say "Mesachek Ani"?
1.
Rashi: When his friend realizes that he is deceiving him, he says 'I am joking.'
2.
Malbim: He considers all this like jesting.
