Kagiso Rabada put aside his disciplinary concerns to set up a series-levelling win for South Africa on the fourth day of the second Test against Australia at St George's Park on Monday.
Kagiso Rabada was already facing censure for his behaviour after Steve Smith's dismissal in the first inning.
The masks were likely to have been worn to taunt Australian batsman David Warner, whose wife reportedly had an encounter with Williams in 2007 before meeting Warner.
David Warner was fined 75 percent of his match fee and given three demerit points following a bust-up with South Africa's Quinton de Kock as the players went to the dressing rooms at the tea interval on day four.
Both players were punished Wednesday for the bust-up during the opening Test in Durban, with Warner fined 75 percent of his match fee and De Kock 25 percent.
The International Cricket Council said that match referee Jeff Crowe will remind the teams of their responsiblities after Australian vice-captain Warner was fined 75 percent of his match fee from the Durban game and the Proteas wicketkeeper/batsman docked 25 percent.
De Kock was found guilty of a level one offence under the ICC code of conduct.
David Warner was found to have breached Article 2.2.2 of the ICC Code of Conduct for Players and Player Support Personnel.
The two have been charged under the clause of bringing "the game into disrepute", with Warner facing a more serious level-two charge than De Kock's level-one offence.
"The incident was discussed between the two team managers and the match referee last night and it is now in the hands of the on-field umpires and the match referee," Cricket Australia said.
Quinton de Kock allegedly made some derogatory remarks about David Warner's wife, Candice, instigating the Australian.
The International Cricket Council has charged Nathan Lyon with a Level 1 breach which could lead to 2 demerit points and a 50 per cent fine of his match fees.
A video of Australian vice-captain David Warner engaged in a heated argument with South African wicketkeeper Quinton de Kock has gone viral.
A footage has surfaced of an angry David Warner being restrained from a heated clash with Quinton de Kock on day four of the first Test between South Africa and Australia.
David Warner had a great Ashes series but struggled with the limited-overs format.
Australia completed the tri-series undefeated, notching convincing wins in all their five matches against New Zealand and England.
Dhawan smashed his fourth Twenty20 half-century, while Bhuvneshwar Kumar claimed his maiden five-wicket haul in T20I to emerge as the main architects of the victory.