Gus yells down to the others, "Hey Guys, the shit is about to hit the fan.  Glassback 60 meters and closing."

Dreki stands and says "Sithri, take to the sky, go invisible and let me know what you see and if you see more trouble coming our way."

She uses her Soothing Heart ability and casts sanctuary on Solenne. 

"Are we staying here and defending or making a run for it? If we are staying here I can cast a wall of thorns between us."

Gus climbs down to the lower level and prepares his mace.  "I'll follow your lead"

...

We are preparing to fight. If it gets to the bus it could damage it. To stand my ground with myria

Dreki moves outside the bus and when they are within 120' cast a wall of thorns between us. 29 Damage if they fail their DEX Save or 14 if they save. 

Gus reaches over and gives Dreki the Blessing of the Trickster, giving him advantage on Dex (Stealth) checks for the next hour.