Yes didds, I do get that. Instinctively my feeling is that his action in reality definitely was dangerous, whereas the alternative (ie keeping hold, not standing up) has potential to be dangerous. But also potential not to be.
For example; I saw his action as being more of a dive than a jump (others will i'm sure disagree

) but this being the case, we know that not every tackle on a diving player, going for a try as an example, ends up with the ball carrier landing on his upper body/neck/shoulders/head.