The refs will simply send up every decision as I don't know.Hold on people. The problem is not the bunker but the rules.
When the ref says 'I have try' then the bunker has to find - beyond any doubt - complete proof otherwise to overturn. The 50-50 call has already been decided.
I agree with Barrett, there should be a third option:
1) Try. 2) No try. 3) No ****ing idea.
The signal could be a shrug of the shoulders and palms up.
The bunker boys can then use the technology to call it as we all see it, rather than to seek incontrovertible proof either way to overturn.
Its time to ditch the technology altogether and get back to basic simple footy.