"Got it!" Shepard replied. Her version of grenades weren't all that dissimilar, to be honest. But she'd come from a distant future, in an alternate timeline, where technology was far more advanced than it was in this universe's Earth. She did as instructed, holding the red button for three seconds before taking aim and letting the grenade fly, quick to duck and cover her head.
While Spider-Man had no way to translate what Groot was saying to him, he at least understood the meaning based on Groot's actions. "Keep it up and we're gonna become fast friends, big guy!"