Well considering I got the blame for the other thread closing, I am still the only one so far who has posted on topic.
How about less whining and playing the blame game guys, and more addressing of the OP's question!
Thank you for you co-operation.
Now, most of you will know my position on this, which is
1. a team-mate is entitled to run in support of his ball carrier - this is a given.
2. it is for the support runner alone to decide how best to support his player.
3. the support runner is only guilty of obstruction if he intentionally obstructs a tackler - Law 10.1 (c) refers
4. For mine the indicator of intentionality is a sudden change in direction or speed to get into a blocking position. This simply did not happen.
I am happy that Thomstone did not obstruct the potential tackler. The referee and the TMO had a look at it and also decided it was OK.
There were arguments in the other thread about Thomstone possibly being millimetres in front of the ball carrier or not in a position to take a pass or to enter through the gate should a tackle take place, etc etc. I disgreed, but even if there was something to it, the fact that these issues required micro-analysis and repeated frame-by-frame observation of the video of this piece of play means that they fail the "clear and obvious" test at the first hurdle.