There's a saying in a number of arts I've encountered that say to treat the one as many and the many as one. What this means, from an SD perspective, is that one atatcker should be treated as if there are multiple attackers. And multiple
attackers should be treated either individually or as a single unit.
In a multi-attacker situation, there is simply no time to do any fancy schmancy moves. In an SD situation against multiple attackers, you need your stuff to work immediately. Anything more than 1-2 techs per attacker is wasted time and effort, and provides the other attackers ample time to close the gap.
In the arts I encountered, the tried and tested method is to continuously enter into the attackers' space, using one or 2 attackers as a shield against the others, or to circle the group from the outside (treating the many as one).
So, whilst it is highly conceivable for a kata with a block, counter, turn/pivot, block, counter sequence to imply a multi-attack situation, the likelihood of application in RT is highly unlikely, if not impractical.
The more likely explanation is that the turn or pivot is there for strategic positioning purposes (tai-sabaki), i.e. to place the current attacker between you and the next attacker, like a shield, or to come off the line of attack and meeting the intended force at an angle.
The more logical explanation, therefore, for the subsequent sequence is for a lock/throw/takedown on the current attacker, which then places them between you and the next attacker.
So, whilst on the surface, a turn and pivot in kata could imply multiple attackers, the more probable scenario is that it serves to work the angular vector forces in a one-on-one situation, which places you in a position of strategic advantage to apply a follow up.
In any case, it doesn't make sense to turn/pivot such that your back is facing another attacker so that you are blindsided, or present a target for a king-hit.
And for those who believe that there is no grappling in TKD, have a look at Choi Hong-Hi's 1965 work on the subject - if you can still get your hands on a copy.