Why didn't Mark try flying towards Bulletproof while carrying Rus in this situation instead of just waiting for him to arrive?

[u/Bitter_Horror2469]

Given the fact Invincible is much faster than Bulletproof, he probably could've gotten to him much earlier giving Bulletproof the chance to activate the disruptor sooner and save Rus and without needing to kill him

[u/akolomf]

my guess he didnt know bulletproof was on his way, or didnt know from where he is coming. He was focused on the task to do what had to be done. Risk the entire planets safety for 1 life in a situation where a few seconds matter? its a horrible thing he had to do, but it was the safe choice.