Your cape is not gonna absorb the knockout gas that explodes near you is it? Working with two military guys, Metalla could have one fit the gas pellets to an RPG and fire it near you. Won't have to hit you directly to effect you, just near you. In you burn it up the gas will still be released, knocking you out cold
There is no way your blocking a three pronged assault that attacks you with gas, blinding light, AND arrows. Not without prep, which you don't have.
He can hold his breath and move out the smoke, then throw a fire bomb to incinerate you team
Space Marine power armour is impervious to flash bombs, or the fire bomb. Ice bombs are useless, as well, Lucius will break out of them without breaking stride.
Captain Colds cold feild freezes anything Starburster has to offer, while Middy sees everything he plans to do in advance, and counter everything and almost effortlessly beats him. Either Cap Cold or Middy stomps this, both is overkill, and Deathstroke is just there to laugh at it as it happens. Sorry, but there really is no way around that cold field, except for being a speed force conduit, in which case you survive,b ut are temporarily depowered and have to deal with Cap Colds amazing reflexes and aim with his freeze gun.