This incident isn't the first incident of it's kind from this user. Apparently he's been building up quite the reputation with his peers of thievery. This user doesn't act like a moderator, and does not utilize the powers he's been given in a manner to which we would expect a moderator to behave.
Stealing from anyone when the only way you can get to them, or open their chests is because you are a moderator and have access to MOD+ commands is wrong. There's no way around that. It's just wrong.
Further more, fighting someone (actually fighting someone) with god mode on is unethical to say the least.
For screenshots the below link...
imgur.com/a/Y4rf0#ccZCr
If any of the images appear half grey, click the little gear in the upper right corner of the picture and "view at full resolution". This seems to bypass that little bit of trauma.