Can never know what's going on inside a blokes head but being ex fast jet he may have been type A ish ? He probable flew through , around or over this type of weather a lot this time of year ? He was one of 3-4 Air Asia aircraft all going in similar direction dealing with same weather system and they where not holding or turning around . There was heavy long haul A/C on same track . Add in a 4 sector day over 11 hours with possible holding in SIN .