⟩ Tell me as a team lead how do you pacify an angry client?
There are two rules to follow when dealing with a client:
1st : Client is always Right
2nd: Even if the client is Wrong, Refer to rule no 1.
Since the client is angry, as a lead accept the mistake (blame) whatever the client has to say. If you start with this... the client is bound to get relaxed after 5/10 minutes of shouting... Then try to explain the game plan to follow from NOW (Please prepare for this as a lead you should be ready for this anytime).