The Warden has ordered you to turn and face somewhere else, therefore their previous order is null and void. If any T gets killed for doing what the Warden has ordered them to do, then it is a freekill. Remember that if Ts are not following the Warden's orders within a reasonable amount of time, they are delaying and may be killed.
Even if it is after 5:00 and tarping is allowed, this doesn't mean freekilling is allowed. Tarping in itself will honestly hurt the CTs more then it will the Ts (end up with CTs being slain for freekilling due to a tarp order).
To sum this all up, if the Warden has ordered you to look away from him, then you Must do so, otherwise you are delaying the order, which is a killable offence.
TL;DR - If you are killed for looking away when the Warden told you to do so, then it is a freekill. It may be a tarp, but a freekill is a freekill as you were simply doing orders.
- Dat guy, Forest
Any time you need to sum something up, get forest on the job