This is because they are using their language skills to guess the words, and then answer the question. Ex: student can't read (aka can't decode) the word in front of them. Student looked away but was also able to figure out the word using language comprehension, content knowledge, context clues, etc. Thinking process might be something like: "I'm reading about caterpillars and I'm not reading that big long C word which is caterpillar. It's not caterpillar, we're reading about butterflies, I guess that word is 'cocoon'." In this example, the student was able to deduce what the word was.