Reproduction Steps: 1. Deploy a champion with charge. Corgi Knight is a good example. 2. Deploy a champion with orb of frostfall. Ferren Snowspinner is a good example. 3. Move a Corgi into the range of charge. 4. Corgi Knight will be unable to charge the Ferren Snowspinner DESPITE having no impeding terrain between him and the Ferren. 5. This is even worse on maps with different elevation types, because you're able to charge a target that's standing "below" you and will waste your charge and AP as a result despite the ability's description telling you you shouldn't be able to do it. @Sokolov
Could the ability info include this bit? Something like (example of charge 3): "This champion moves 1-3 spaces in a straight line through non-impeding terrain and makes a close-combat attack at +3 damage. This ability cannot target champions standing on impeding terrain."