Honestly the part that surprises me the most with the adaptation of this chapter to episode 19 is how much distance they added to this fight. Between these last two chapters in the manga Tanjiro covers like 5 meters at most and he moves immediately from his first use of Dance of the Fire God (way better name imo) to slashing at Rui's neck. The anime has Tanjiro start from much further back and inserts practically an entire chase sequence between beginning Dance of the Fire God and actually making a strike at Rui. There are certainly reasons for it, like more time for the narration and music to play, showing off more of the beautiful animation, and avoiding what would have probably been a full 3 minutes of slow motion on two strikes to fit all of the reactions and flashbacks and such.
Tl:dr - Ufotable took some liberties with the pacing and spacing of this sequence but it's gorgeous so keep it coming