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Tension in a conversation is created by disagreement, rejection of arguments, attitude (hatred, resentment), misunderstanding, confusion, attempts to convince or sway somebody that fall on deaf ear...
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#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/32105 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/32105 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
Tension in a conversation is created by disagreement, rejection of arguments, attitude (hatred, resentment), misunderstanding, confusion, attempts to convince or sway somebody that fall on deaf ears, including offers of bribery (monetary, sexual, information or other services) that do not work, or are considered. Tension is created by clashes, IF the reader cannot predict with certainty how they will turn out. In your case, I suspect you are engaged in "false jeopardy" since your MC is the one in supposed danger, unless this occurs in the last few pages of the book. 007 is never killed halfway through the movie. If he jumps out of a plane without a parachute, he will not hit the ground. If somebody puts a gun to his head and pulls the trigger, it will be empty or misfire or the shooter will be killed before the gun fires. False jeopardy is very difficult to pull off, your readers will only be interested in how your MC gets out of it, and if it is all conversation with somebody that has already murdered someone else for the same reason, and fears being killed by your protagonist? I personally would find that impossible to do with even a shred of plausibility.