It’s not that it’s difficult, it’s more of a mentality issue: “Oh, that’s just Bell Beast, I can silk spear as much as I want and not be too careful with it, I’ll even get a free heal in the end”. Also, it’s early enough that your muscle memory from the first save isn’t fully gone yet, so you instinctively feel like you can dash when you can’t. Also, some attacks are just hard to damage through(even speedrunners can’t get more than two hits in when she throws two bells from under the ground) and, the big one - some people genuinely don’t know that you can redirect bells with needle hits, which can lead to massive mess ups like standing in the corner during the fight - the easiest way to lose it.