There are feelings that words can’t explain.
There are words that can’t serve their role precisely.
However, we are human that has been granted a very wonderful mind.
Humans are very perceptive and observant.
At least, some of them.
We don’t really need words or any specific explanation.
Sometimes, we just feel.
We just know.
Even then, we might not know what to do that we know someone is feeling uncomfortable or angry or frustrated.
The least we can do is to acknowledge their feeling and give them room to express themselves.
Give them time to sort themselves out.
For them to come to terms with their own thoughts.
Just make sure they are aware.
You are there whenever they need anything.