Well nowdays, you can turn people red while they are away from thier computer or not paying attention to L2.
You simply follow all the following steps:
1) Get you summons HP to as low as possible
2) Give reflect damage (buff) to the person you want to turn red
3) Simply hit with summon on the person you gave reflect damage and the person will kill your summon with his damage reflected & become red
4) Kill this person which now is red
5) If you're lucky this person has more than 5 pks & you'll be able to pick his drops after killing him
This can also be done with transferpain & an elpy
Have fun doing this, I know I had. ;D
This works at Dragon-Network