be careful guys i think this is a brought acc.
or he may be trying to make a quick exit. id avoid escrow until further notice.
I can't say with 100% certainty one way or another if SebastianJu is a purchased account, but I don't think it is.
Based on the screenshot that MintJellyToes posted, it looks like the amount in dispute is .1 BTC, more specifically .1 BTC that were sent to 1MhMNXUkNFaBUHMnqjnqDczcihdemtBfZg via 68126c1368713ea6db072c18bdea37116694720c6e615a294e080b7a45bbece6 and that MintJellyToes is unable to prove that the BTC from the above transaction was his.
If the above amount is correct then I can say with a near 100% certainty that Sebastian is not in the process of pulling a runner considering that there are reports of him releasing both a 5 BTC and a 21 BTC escrow in the last ~2 weeks, and I would personally doubt that either party that he released the BTC to are his alts.
Regarding that screenshot, anyone can fake a screenshot that was apparently presented by MintJellyToes. If he really sent the .1 BTC to the escrow address from his polinex account then he should give Sebastian temporary access to his account so he can personally verify that it was MintJellyToes that sent the transaction. Otherwise what will potentially happen is that he will release the .1 BTC to MintJellyToes then the next day "someone else" will come along who is willing to prove they sent the .1 BTC to that address with access to their polinex account. There is really no legitimate reason why MintJellyToes would not be able to allow Sebastian access to his polinex account, at least not in my eyes.
I also hope that this situation serves as a lesson to SebastianJu to not give more then one party the same address to send to for a trade. This way he will know with near 100% certainty that any BTC that makes it into particular address belongs to a specific person. If he wants to, then after a certain time he can tell both parties to a trade that any BTC sent to the address after a certain time will be his property (for example if the buyer never funds escrow and he wants to give that address to someone else for a trade). This practice will allow SebastianJu to avoid these kinds of disputes, which I do not doubt are a major headache for him, and will also allow his customers to enjoy a greater amount of privacy.
https://blockchain.info/address/1MhMNXUkNFaBUHMnqjnqDczcihdemtBfZg