The first thing I want to mention seems to be an undocumented feature. When the Chemist uses BYSSEPS he gains +1 Base Attack. This will stack with each cast, but of course will be lost once he attacks.
The other thing is a bug involving burning stacks and knockback. This picture shows a before and after:The prediction shows the enemy only taking 2 burn damage (33-20-5(25% KB)-2 = 6). The result shows that it takes an extra 2 damage after hitting the wall. I tested with other numbers of burn stacks to verify that the burning is causing the extra damage. Either the double application of burning is unintentional or the prediction is incorrect.