Did Thel' Vadam pick up Master Chief's signal?

Do you think that Thel’ Vadam picked up the distress signal Cortana sent out at the end of Halo 3? But why would a Sangheili attack Master Chief at the beginning of the game?

Read Halo: Glasslands.

Rogue Covenant, maybe they picked up the signal.

the “covenant” fleet outside johns ship are probably rouge or have been cut off from the main fleet for a while.

Probable a “splinter” group of covenant

I doubt Thel could give less of -Yoink- about John with the problems he has on Sanghelios.

> Read Halo: Glasslands.

it explains what is happening with the covenant and humans after the war.