“Can you beat Halo Infinite on Legendary without firing a bullet?” That’s the question posed by Tom, a Halo speedrunner and YouTuber who, like many Halo speedrunners and YouTubers, is on an endless mission to push the first-person shooter to its limits.

Tom recently completed Halo Infinite on Legendary—the game’s highest difficulty setting—without firing a single bullet, and posted a highlight reel of the run on his YouTube channel, Simply & Slick.

Read More: Halo Infinite’s Ridiculous Physics Are Just Like The Old Games.

But nothing proved more difficult than Harbinger, Halo Infinite’s jerk of a final boss.

His current best time in Halo Infinite, completed on console, is 37 minutes and 46 seconds, shown to Kotaku via screenshot of the save file.

If you follow Halo speedruns, you’ll note that it blows the current console record (an hour and four minutes of in-game time) out of the water, but Tom hasn’t submitted it to official record-keepers, since he didn’t capture the run

In deciding to Falcon Punch his way through Halo Infinite, Tom wanted to “try and see if I could increase the difficulty substantially to make it harder for myself.” When you hit the limits, the missions change, as Master Chief says