He have recently discovered a much better system for enabling landmines, to go off, on soldiers.
Instead of using PCOs and death bubbles , he have found out how to get actual landmine projectiles to go off, on soldiers!

Apache Thunder Coding action for You!


This results in full credited kill with working explosion effects, in the multiplayer! Unlike with the PCO system, the kill credit will now even specify what it was that killed, the player instead of the generic kill message.

Best of all it's a lot simpler to set up coding wise, then the old system. Here's all you need to make it work!

SOURCE:
http://gfmod.com/forums/viewtopic.php?f=21&t=1606