If Rossi was a scammer, he'd never accept this kind of visit or would make a more decent presentation like he did with Lewan or would just remain silent. This explosive behavior makes me think that e-cat is true... Unless he is simulating a true behavior to hide a scam. This is a kind of recursive thing.
BTW, one thing that always bothered me about Krivit's video it is that there is a long time cut from the time between Rossi pulls out the hose from the wall and when he shows the steam against the black t-shirt. Maybe Rossi decreased the steam rate to avoid harming people there?

