Australia's Marnus Labuschagne admitted experiencing a rollercoaster of emotions when he became Test cricket's first concussion replacement.
Labuschagne came into the Australia team on the fifth day of the second Test against England at Lord's after Steve Smith was diagnosed with a delayed concussion.
Smith had been hit on the head by Jofra Archer the day before and it took just two balls on Sunday for the England paceman to floor Labuschagne with another fierce bouncer to the helmet.
The 25-year-old was put through the same on-field concussion testing as Smith 24 hours earlier, but came through. He went on to top score with 59 as the tourists held on for a draw.
"Personally, being out there is probably less nerve-racking than being off the field," Labuschagne said.
"When he got hit, I had a bit of a sick feeling, you're kind of helpless. But when you're out there you're in the contest and the adrenaline is rushing pretty much all you're doing is trying to watch that ball.
"When you're off field and your hands are tied...it's a little bit of a shock to the system. But when you're out there, it's all guns blazing."
Labuschagne batted with enough resolve and poise to justify a place in the Australia side when the third Test begins on Thursday.
If selected, he will be well aware of the challenge, having been welcomed to the Ashes in the most punishing way imaginable.
"It got me flush in the grille but it was just 'get up and get on with it'," he said of the ball that sent him sprawling.
"You get up and try and act cool. I think what it does do is it makes you (switch) on. It means there is no mucking around.
"You're watching the ball and you're trying to work as hard as you can to see that ball as early as you can. That's the benefit of facing someone that fast in your first few balls.
"It may be a thing for the rest of the series but it's our job as batters, we've got to find a way to score off those balls or get out of the way."
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India thumped Australia by eight wickets in a warm-up game with Rohit Sharma (60), K L Rahul (39) and Suryakumar Yadav (38) all getting some runs under their belts.
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"We've got players that will definitely 100 percent step up, rise to the occasion. They have more than enough skills," Roy said.