Red Bull chief technical officer Adrian Newey called being "taken out in two races just painful" after the team surrendered the F1 championship lead to Mercedes.
Mercedes entered the British Grand Prix weekend 44 points adrift in the constructors' standings and Lewis Hamilton faced a 32 point margin to rival Max Verstappen.
With just two points from two races, Verstappen now trails the seven-time champion whilst Mercedes holds an unlikely advantage over Red Bull.
Asked how it felt to be back in a championship battle, Newey told the Talking Bull podcast: "[There is] lots of pressure at the moment.
"Obviously, the last couple of races have been very painful for us having had that sweet spot in the triple-header.
"To be taken out in two races and finish with almost zero points out of those is just painful and just highlights how quickly things can change really.
"From everything looking very good, particularly after the second Austria race with a decent points lead and then two races later, we are slightly behind in both.
"I think that is the nature and the tightness of the competition we are in. We have just got to keep our heads down and keep pushing."