I mean, obviously when you have something all the way through your hand, it's kind of bad anyway, but in this case, sea urchins have a venom on them that, if you've ever tangled with them, you know that a sea urchin spine in you gives you horrible, painful inflammation.
Kada vam nešto prođe kroz šaku, to je uvijek loše, ali u ovom slučaju,  morski ježevi imaju otrov koji, ako ste ikad imali posla s njima, znate da vam njihove bodlje zadaju  strašnu, bolnu upalu.