Interesting decision that.
The play went for at least 5 seconds after that before the umpire who was in a perfect position paid the free to Ibbo and called players back.
There was another contest after that where it looked like Nic Nat may have got a free (weags have been paid for a lot less)
I reckon it was a umpire in the stands calling the knee to Ibbos head via the earpiece