Well, yes, beer does go bad, but exactly when depends on your definition of bad (and possibly how many you've already had!). So, does beer expire... when properly stored, the shelf life of beer past its best before date is approximately: Although all food and drink lasts for a shorter period of time if they are not stored properly, proper storage extends the shelf life of beer beyond its best by date.
If disturbed by a blockhead attacking or approaching too close, the troll will pursue the interloper. It is almost as capable of climbing (including ladders), jumping, swimming, and otherwise navigating a cave as any blockhead, although it moves slower, allowing most blockheads to escape.
Move over to the giant, and let him hold the boys while he takes a high dive down into the water below. Get into the water, put little brother on big brother's back, and swim across the other side. Walk back up and around to where the giant is, and head into the cave and the start of Chapter 2.