Scary because he was simulating what happens if you throw a battery in the trash and the compactor mashes it. To that end, the random e-waste, while smoking and hot, did not make a huge fire. In a "realistic" situation, as he described it. Compared to the 20 or so bare 18650s he crushed while standing up on end. But it was very telling to see such an explosion come from a single tool battery being crushed. That, I feel, actually good be a realistic and dangerous situation: someone randomly throwing away their Dewalt battery cuz they're sick of it.