Rival coaches are baffled at an umpire, believing he’d heard a siren, stopping play in the AFL’s Friday night fixture.

Field umpire Ray Chamberlain whistled and halted play late in the third quarter of Hawthorn’s 12-point win against the Crows at Adelaide Oval.

Chamberlain thought he’d heard a siren through his earpiece, and stopped play just as Hawk Luke Breust was shaping for a snapshot at goal.

“I think Breusty thought he may have to dodge Ray Chamberlain as well,” Hawthorn coach Alastair Clarkson said.

“They will work that out, the AFL.

“It’s a shame because this is a great venue and we have had two situations this year, there has been a bit of controversy over the siren.”

In a round nine match, Collingwood believed an Adelaide goal was kicked after a siren barely heard above crowd noise level.

Clarkson said the Friday night mix-up had little impact in Hawthorn’s 15.14 (104) to 14.8 (92) win: two seconds after play resumed, the siren actually sounded.

“Breusty still had to get past one or two opponents to get through, and could have nearly been done for holding the ball anyway,” he said.

“It doesn’t matter too much.”

His Crows counterpart Brenton Sanderson was puzzled.

“I didn’t quite understand what was happening there,” he said.