Command line /delete vs /prompt ?

I followed the tutorial to create a scheduled scan. When I use a /prompt, NOD32 finds the virus, however, my only option is to "Leave" it. There is no delete option.

/local /adware /ah /all /antistealth+ /arch+ /cleanmode /prompt /clean /heur+ /log+ /mailbox+ /ntfs+ /pack+ /quarantine /scanboot+ /scanmbr+ /scanmem+ /scroll+ /sfx+ /unsafe /unwanted /wrap+

Now, when I use a /delete, NOD32 finds the virus and then deletes it:

/local /adware /ah /all /antistealth+ /arch+ /cleanmode /delete /clean /heur+ /log+ /mailbox+ /ntfs+ /pack+ /quarantine /scanboot+ /scanmbr+ /scanmem+ /scroll+ /sfx+ /unsafe /unwanted /wrap+

Why can NOD32 delete the file when I specify the switch, but not when I have it prompt me for action?