I do not think a warning is appropriate here.

If the person in question is actually glitching and abusing this for his/her own advantage, I'd say a ban is more appropriate... "Shooting under ground" isn't a valid reason, and if you think he/she did abuse a glitch for his/her advantage go to one of the lead-team members and let them handle the case. A warning is out of place, and there is a big chance that unless you "caught it on tape" that the map just generated scorch marks there because of the exploding/burning drug labs and you've actually given off an invalid warning to an innocent player.

Glitches and bugs are tricky, and it is better to let someone of the lead-team or even a developer check it out.

I do not think a warning is appropriate here. If the person in question is actually glitching and abusing this for his/her own advantage, I'd say a ban is more appropriate... "Shooting under ground" isn't a valid reason, and if you think he/she did abuse a glitch for his/her advantage go to one of the lead-team members and let them handle the case. A warning is out of place, and there is a big chance that unless you "caught it on tape" that the map just generated scorch marks there because of the exploding/burning drug labs and you've actually given off an invalid warning to an innocent player. Glitches and bugs are tricky, and it is better to let someone of the lead-team or even a developer check it out.