If it turns out that the general claim has exceptions, we may be able to limit it to account for those, as we saw above.
Even with claims we can spot out patterns/faults and limit one's argument with those. It is a powerful tool to use and could make one's claim seem not as sttong.
By pointing this out, we can show that the argument as expressed is invalid.
Pointing out any flaw in an argument always shows the reader that it is not as strong as they thought the argument to be, which in short makes it feel like it is invalid.
Often, a particular claim or reason may sound plausible, but we need to slow down and ask if it is true in all cases.
This is where the slow reading/thinking is good because during every first read we may not grasp everything as it is said. So, slowing down when reading the arguments it's best to get the full idea.