Habits
In a clutch, silence
In one line: When a teammate plays the last duel alone, only speak to give short information.
Why
Whoever plays a clutch needs to hear footsteps and think. Three voices giving different advice cover the sounds and confuse them at the hardest moment.
How to train it
When dead during a clutch, only say short facts ("one B, damaged") and then go quiet. If you know nothing new, do not talk.