FAST bowlers have always pushed the boundaries when celebrating big wickets and former Tets quick Peter Siddle believes umpires will always step in when it goes too far.
South African speedster Kagiso Rabada is facing a two-Test ban for bumping in the shoulder of Australian captain Steve Smith after dismissing him in the first innings of the clash in Port Elizabeth.
Rabada failed to fully curb his emotions in the second innings too, giving Aussie vice-captain David Warner a screaming send-off despite having been charged for the incident with Smith.
Siddle, who took 46 of his 211 Test wickets against South Africa, said every match he played against the Proteas took place in at atmosphere of high-tension and that he might have even gone "too far" with a send-off.
And while the Australian is a massive fan of Rabada, and the emotion he shows, Siddle conceded that the young fast bowler's decision to "touch" Smith was going too far.
"I think I have probably been in all circumstances, I've gone too far with send-offs, and then other times where you pull it back, you know you have to be controlled," Siddle said on Monday.
"I know there are times after a couple of overs you just give the umpire a tap and say "sorry" and they understand.
"There are times you do push it a little bit, and Rabada knocking in to Smithy, it's easy to go around him. Maybe give him a bit of lip, but steer clear of him, there's no need to touch.
"There's things like that which as bowlers we do need to control. But it's the emotion of it all.
"I love celebrating a wicket as much as Rabada does. Hopefully he keeps celebrating, I love watching it."
Siddle said it would be unfortunate for the series if Rabada was rubbed out, because the hard-fought nature was what made it so watchable.
He said the umpires had shown no indication the players had gone too far too often, except for the stairwell incident with Warner and South African keeper Quentin de Kock, and they would reel it in if they saw something they didn't like.
"It's always been the big thing, all the series I have played against South Africa, that's how it's always been. Out on the field it has always been like that," Siddle said.
"The good point has been that if you step over the line on the field the umpires will intervene. At the moment, the umpires have been keeping it in check on the field.
"I like those battles, it's what makes great Test cricket, it makes people want to watch it. It's going to be like that for the rest of the series."
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