Remus stopped the spell as soon as Harry jumped to avoid it, waiting to see what Harry would do now. Despite the battle high, a part of him was still aware this was also a teaching event. When he conjured smoke, Remus moved as well, tracking Harry's movement by sound so that by the time the spell cleared he was only a couple feet from where Harry stood. The reducto knocked him off his footing, but instead of fighting the fall, Remus used it, rolling beneath the majority of the other spells rather than wasting energy blocking them.
Where there's smoke, there's fire.
Completing the roll, he threw a Baelfire spell at Harry as he stood, the same one he'd been perfecting since November, turning a spell designed to conjure the illusion of a small green flame into an illusion so real one could feel the heat of the flames as one was engulfed in a tower of angry orange fire and needed to look in order to realise skin wasn't burning despite the smell of burning flesh that accompanied the sound of crackling fire. That casting motion flowed into an arch with one arm extended to clothesline Harry through the illusion as Remus prepped another spell with his other hand.