If one clears one's throat without need and two letters become distinct, does the prayer become invalid?

Question : Or if one clears one's throat without need and two letters become distinct, it is invalid.

Answer : If one clears one's throat without need, then the prayer becomes invalid if two letters become distinct. The need for clearing the throat is either limited or extending. It may be limited, where one clears one's throat when a person feels a blockage in his throat.
A blockage, so he clears his throat to remove this blockage, or as they say in the language of mechanics, to lubricate the throat. This is permissible. The extending type of clearing the throat is when one clears his throat for a person who is asking permission to enter, or fears that he will fall into something, or something similar, or intends to alert him that he is praying. This is clearing the throat for an extending need, so the prayer is not invalidated by it because it is for a need, because this is for a need. If it is for no need,
then the prayer is invalidated on the condition that two letters become distinct. This is because clearing the throat without need is closer to joking than to seriousness. Now, is it a need? To clear one's throat when the imam prolongs the bowing or prostration in order to alert him that he is saying "let's go" or "let's not"? Is this not a need? This is not a need unless the imam prolongs it to a degree that goes beyond the prescribed limit. In that case, this may be a need.