After a tense wait, they have entered the T20 World Cup semifinals, but now that New Zealand has reached there, Mitchell Santner will refresh himself, and the rest of his team will follow his lead.He is always calm, which is why he is called 'Flatline' (one who remains unruffled or unagitated). Only towards the end of New Zealand's innings, when a ball hit off his own bat flew for a six, did Mitchell Santner's heartbeat seem to overcome his calm demeanor, and he appeared slightly agitated. He was still annoyed that he couldn't strike it faster and straighter.Also Read: 'Serial...