these all seem a bit far-fetched to me
for instance, how do they know that fellow's heart stopped?
also, it's not WHERE you inject steroids that the enhancement occurs, it's a system-wide thing, hence the testicular-atrophy and so on. So why would that fellow's left arm be stronger?
How about the "crashing through pure titanium" incident? I could crash through pure titanium too, especially if it was nice and thin. Anyway titanium can be quite brittle. And why would they make a wall out of it? titanium is enormously expensive, and titanium-steel would be stronger.