Wrong Time - Chp 5 - Pg 3

I can't really buy it. Trunks was concerned about polluting the timeline in the first story, but the moment Frieza and his goon squad made a decisive move that could get people killed he didn't hesitate an instant to take them all out in short order. I don't think Trunk would hesitate this much with innocent people in danger of being killed. He's seen to much of that already to let it play out this far without doing something about it.