ST KILDA coach Ross Lyon was last night seeking answers about why the Telstra Dome roof was left open yesterday until after 1pm despite rain lashing the ground by midday.

While Lyon was in no way blaming the slippery conditions for his side's 31-point defeat, he was left ruing another upset loss for his Saints and another hamstring injury, this time to Sam Fisher.

The Bombers emerged with injury concerns of their own, with Jason Winderlich a late withdrawal from the match with a hamstring injury, Leroy Jetta out of this week's Anzac Day clash with Collingwood due to a groin injury and David Hille in doubt after a knock to the chest.

Bombers coach Kevin Sheedy had the consolation of a somewhat unexpected 3-1 win-loss record for the season.

Lyon questioned whether there was some agenda at play to produce a certain style of football.

"It's interesting, isn't it? It's interesting to walk in at 12 o'clock and see the rain coming down and the roof's not shut," Lyon said.

"I suppose you have to look at the aim and the agenda of clubs and the stadium and the AFL, what you want to produce, I suppose what sort of spectacle.

"Maybe we want wet, slippery conditions? But in saying that, both teams had to play in it, so it's no excuse. They've got (Matthew) Lloyd and (Scott) Lucas, who are super forwards, so it's no excuse. I've been interstate for a while so I don't know what the agenda is."

The closure of the roof is decided by the AFL. It is believed that yesterday Telstra Dome officials notified the AFL of the inclement weather heading directly towards the stadium more than two hours before the start of play at 2.10pm. But a decision to close the roof was only made at about 1pm, the roof finally being closed at about 1.10pm.

AFL spokesman Patrick Keane said that when the AFL is made aware of the potential of rain at Telstra Dome "we make every endeavour to get the roof closed as quickly as possible".