>Walk: East

Seems like the command does not need a colon after it, which makes sense. You do wonder for a moment if "around" is an argument that is meant to be used as a second or third value to a different branch of the "walk" command, since it only spat out an error about an unspecified direction.

Also, you read the next command and saw that it also contains the same error, so you are saving everybody the time and potential embarrassment that would ensue from inputting that.