@Kaffe@glaceon.social ...my immediate thought is CP Violation which is a really good, tense opening to a bass heavy combat theme.

Triage at Dawn is a more morose sounding track that fits the "extremely half life 2" descriptor and is used a lot in other things too. Very short track tho.

Though I've not heard it often , Kaon is a good HL2 track, i'm... more reminded of Duke 3d by it tho rather than Halflife 2 lol.

"You're Not Supposed to Be Here" is a good D&B/breakbeat styled combat track.