Denrag pings another location
Quake kills Erinyes
Sabrael casts haste
Sunna moves to position and readies trippiness
Shadow demons attack Quake. They are still invisible, but he knows their locations now (50% miss chance will apply)
Babau charge in. Sunna trips two successfully.
Babau 1 attacks Denrag
Babau 5 attacks Denrag
Babau 3 attacks archon
Check the rolls against your AC and take appropriate damage. The attacks on quake are Touch Attacks.
The party has initiative!