The interpreter grasping their chin as if in anguish might be adding a layer of emotion to the sign. This could indicate:
* Deep concern: The interpreter could be emphasizing the weight of the situation being discussed in the song.
* Sadness or sorrow: The sign could be expressing the emotional impact of the song's lyrics.
* Hesitation or uncertainty: The interpreter might be portraying the character's struggle with a difficult decision or situation.
It's important to remember that sign language interpretation is nuanced and can vary based on the interpreter's individual style and the context of the song. Without knowing more about the specific song and the interpreter's background, it's impossible to say for sure what the precise meaning of the sign was in this instance.
However, the sign itself is generally associated with thoughtfulness and mental processing, and the interpreter's expression adds a layer of emotional depth to the meaning.