>>713547198
>>713547198
>>713547383
He is emotionally stunned and doesn't give a shit about killing people or dying (see pic rel: his reaction to getting killed by Frisk in a neutral run)
Only when he starts opening up to his best friend does he realize that he isn't actually empty (as the UT Clock app dialogue implies) and there are still feelings inside him. In a way, Flowey was completely right -- Chara was the only one capable of making him feel anything again.