getting it to lase with a KTP would be pretty cool.
2W of 808 doesn't make a ton of green... maybe 500mW in a good situation
BUT this light is already 1064nm as it comes out of the laser, it basically takes care of the 'first half' of a green laser cavity for us. I bet if the KTP were heated and everything was aligned well you could get a watt of 532nm out of it.
SO yes, if he just set it up to where it would make a little bit of green and left it, it probably wouldn't have a ton of power. But if it were really aligned well and setup nicely, it would make some nice green.