Ben Duckett (19) edged Cummins to Cameron Green, who again showed his brilliance in the field by diving low to his left at gully. The dismissal survived a review despite the replay initially drawing jeers from home fans.
Three balls later Zak Crawley (7) was caught by wicketkeeper Alex Carey off Boland.
Enter Root, Australia’s nemesis in the first innings with his 29th test century, who skipped on to the pitch despite the increasing gloom and doom on what had been a mostly unthreatening wicket.
Root survived an early appeal against Cummins for a catch behind. Two balls later, heavy rain forced the teams off again. Ollie Pope and Root are both on 0. Even under England’s aggressive “Bazball” style of cricket, neither batter would likely be too keen to get back out Sunday.
England earlier ran through the Australia tail to take a narrow first-innings lead of seven runs after Australia had resumed the third day on 311-5.
England seamers Stuart Broad (3-68) and Ollie Robinson (3-55) bounced their way through the lower order. At 338-5, Australia had looked like taking a useful first-innings lead but Robinson claimed the key wicket of Usman Khawaja and only Cummins provided more resistance.