You don't expect the inert tentacles to come back to life on their own, but you're also not about to risk leaving them lying around. You step forward to DE-ARMIFY the creature's remains, but then pause to wonder if you should investigate its biological properties further so you can figure out what you're up against. Life-or-death situations notwithstanding, it's hard to resist the urge to do some good old fashioned EXPERIMENTATION.