Funds are deducted from your account within a few minutes of Payout approval, not the moment you submit the request. If you keep trading after submitting a Payout Request but before it is approved, and your balance drops into the Profit Buffer, your request may be denied.
If your balance drops below the Profit Buffer after the deduction is made, your account is at risk of breach. You should trade as though the requested Payout amount has already been removed from your balance, from the moment you submit the request.