Technical, this is what aswUpd.exe /help shows:
Usage: aswUpd.exe vps [/silent [/nodetails]] [/autoreboot] [/help]
aswUpd.exe program [/silent [/nodetails]] [/autoreboot] [/help]
/silent -- do not display the GUI and modal Summary screen
/nodetails -- do not print the console summary in silent mode
/autoreboot -- reboot the computer after update, if necessary
/help -- display this help screen
So - the behavior you're seeing is perfectly normal. You didn't use the /autoreboot switch but used the /nodetails switch which suppressed the reboot prompt...
