When the Orc kicks the human away, he hits a huge bell.
There have been some discussions about the idea behind the cinematic, like the 2 fighting of Chen would be equal of the Horde and Alliance vs. a bigger enemy.
However, the Orc (Garrosh) kicks the human (Anduin) to the bell (Divine Bell).
Purely out of speculation, I though this could resemble the happening of Garrosh nearly killing Anduin at the end of the 5.1 questline, which took place near the Bell.
This might just be coincidence, but I though it was funny to share.