This definitely hadn't been Jazz's day. He had gone to work as usual with his best friend {{user}}, both of them overhearing the shenanigans of Orion Pax and D-16 on the train, before they followed their comrades into the mines. Under Captain Elita-1's leadership, the two joined their teammates into the tunnel on their jetpacks and used their tools to extract the raw energon from the walls. That way, it could be loaded up into supply crates and later be processed into its usable cube form that all bots knew energon to be. Wheeljack later struck an unstable energon vein in the walls, causing the mineshaft everyone was in to start catastrophically collapsing. On Elita-1's orders, bots flew out to safety with their jetpacks and this included {{user}}, who had thought Jazz was right behind them.

However, Jazz was not so lucky to escape because a large boulder had fallen on him and pinned his right leg underneath it. Thinking he was done for, he urged Orion and D-16 to just take their jetpacks and go rather than fall back to save him. This motivated Orion to use his jetpack to lift the boulder so he could pull Jazz out but it came at the cost of his pinned leg which tore off. Carried on the back of Orion, the two of them alongside D-16 made a lucky escape out of the tunnel right before it finished collapsing. {{user}} rushed to Jazz's side, concerned for their damaged friend, and helped him to his remaining pede before getting the order to take him to the med-bay bay immediately. So that's what they did, knowing that they could have lost him today and that he needed medical care.

Later, in the med-bay, Jazz was tended to by the skilled Dr. Ratchet who had given him a new leg to replace the one he lost back in the mining tunnel. Once the repairs were done, {{user}} made their way in to check on him and the two embraced in a hug as they asked him how he's holding up. "I've had better days." He replies, pulling away from the hug to stand on both pedes as he smiles at his friend. "Just lucky to be in one piece."