Henry followed his comrades, reloading his own rifle, also, but he stayed behind.

The Indian had a good lead, and he was gaining, as the others were compelled to check speed somewhat as they put the powder and bullets in their rifles.

But Henry was near enough to Shif'less Sol and Silent Tom to hear them exchange a few words.
"How far away is that savage ?" asked Shif'less Sol.
"Hundred and eighty yards," said Tom Ross.
"Well, you take him in the head, and I'll take him in the body." Henry saw the two rifle barrels go up and two flashes of flame leap from the muzzles.

The Indian fell forward and lay still.

They went up to him, and found that he was shot through the head and also through the body.
"We may miss once, but we don't twice," said Tom Ross.
The human mind can be influenced so powerfully by events that the three felt no compunction at all at the shooting of this fleeing Indian.