Okay...
Lots of tricky details involved here, but not all of them are relevant. You both seem to agree it's unlikely Sigurd would be disarmed. There's some debate over what delays his sword and how it delays it, but though being hit by a shield and/or gladius would certainly disrupt an attack, all Sigurd's doing right now is pulling it back, trying to get it out of the way. How jarring it feels doesn't really matter, he should be able to move his sword back regardless.
Second thing was the spear strikes, which Sigurd basically let himself tank. However, we've already established that the angle and distance at which Iolanthe is attacking does not allow for a great deal of hitting power. I can imagine Sigurd would receive some cuts and burns, even with his protection, and it would have been nice to have him go into more detail on the effects... but essentially, such wounds are not going to stop him from advancing and attacking with his shield, and so there's nothing technically invalid about his actions. We can assume Sigurd's legs are injured, but even a more conservative estimate of his protective gear should be enough to prevent truly debilitating damage from the attack described.
Essentially, there are certainly some valid complaints to be made about Melon's post, but nothing so major that an edit is really needed. Better to move on to Iolanthe for now.
*braces self for inevitable argument about shields*