I'm think I'm sufficient competent, because I'm learning from my mistake/forgetfulness; but someone make me really trouble. Thanks again to the community.
What happens when your mistakes/forgetfulness cost someone a lot of bitcoin or the admins don't step in (which they luckily did for you in this case) and the account is forever ruined or perma banned? Can and are you prepared to foot the bill? You need to take that into consideration because being an escrow isn't a responsiblity or worry-free job as people are depending on you for a smooth and safe transaction and you need to be able to guarantee this from your end.
That's the only way to do it. If someone asks you to provide escrow for their transaction and you lose the collateral or fail to secure the transaction, you're responsible.