Adjust. If you know someone is using one, avoid chokepoints. Pay attention to the floor. Position yourself better. Witherhoard is not OP, and doesn’t need a nerf. Stop.
If they just shoot it in any area, just avoid it. Go around, or re-position. If it’s in a choke point it’s strong, yes. But that’s literally the point. Having the map knowledge to control those areas are important. They get 2 shots to start, only get more on kills. So, bait the shots and avoid the red goo. Most certainly does not need a nerf.