They were waging a war
a tit-for-tat strugle against each other
in another forum,
I did not talk,"laughed up my sleeve"
and thought my attitude? is tactful.
Question is:
Does tactful belong to attitude?
Then I chcked:
Adopt tactful attitude to inform and convince interlocutors to accept unforeseen situations, such as waiting longer than expected,...
tactful trick is OK.