I'd say 200 is reasonable. 140-160 is jogging/running, which is not that fast. When you're about to die and fight-or-flight reactions kick in (i.e. your whole entire body shifts to "OH SHIT" mode), I'd expect your HR to be through the roof.
The other thing that's bullshit about the graph is that there are only 4 evenly spaced data points for what sounds like a 5-10 minute encounter. Don't believe it at all, why wouldn't you show real data? Or talk more about the data if that was the point of it?