Odd Language #33: Another Missing Comma

‘”Mark stop!“‘ — Mercedes Lackey, “Burning Water”, p. 171, ISBN: 9-812-52485-3. This book was a very good read.

The issue: There should be a comma between “Mark” and “stop”. To mark is a verb so a sentence could be constructed where this lack of a comma results in even more ambiguity. “Mark, the tests.”: “Mark, give me the tests.” vs. “Mark the tests.”: “Grade the tests.”