I Finished Half-Life: Alyx in 12 Hours and Can't Stop Thinking About It

While exploring a worn-down warehouse, I look through a window and see a room full of zombies. Headcrabs -- disgusting parasites that turn their hosts into monsters -- twitch atop the heads of three former humans. I'll just open the door, toss in a grenade, and mop up any survivors. I remove the pin and grab the handle. The door is locked, leaving me with a live grenade and nowhere to toss it. Inside is a bug that will heal my wounds, letting me survive to another day.