Personally, I've got mixed feelings. If it's ONE and only ONE mirrored trade, I believe LiteForex should have flagged both of the accounts for monitoring and waited. If this is one example of a series of mirrored trades from the same IP or if there are other links between the two accounts that indicate that they were operating in tandem to "hunt" bonuses, then LF was acting within commonly used boundaries regarding potential bonus abuse.
Alexander, is one trade from the same IP all you've got? If so, my recommendation is to reactivate the accounts or to send the profits made already if you don't want to have to monitor the accounts.