Harry felt he had still overestimated himself a little.
Although he had already grasped the principles and structure of the barrier spell Dumbledore had left behind, when he actually tried to replicate it, he discovered that a very real gap remained.
First, even though he understood the barrier's magical structure very clearly, he could not construct anything that complex while casting the spell.
Second, his magical power seemed to fall a little short as well.
Finally, the stability of his magic was still somewhat lacking.
In short, after spending ages working on it, he had managed to create a barrier less than half the size of Dumbledore's and enclose Grawp inside. But even with this much smaller barrier, he could only guarantee that it would last five days.
Even so, Hagrid, Hermione, and Ron all thought this was already quite remarkable.
"If I practice some more, I should be able to do better, but I'm afraid that'll take some time," Harry said, a little embarrassed.
Given another two days to practice, he thought he might be able to reproduce a barrier as large as Dumbledore's. But keeping it going for five days was probably the limit of what he could do at this stage.
He could not, as Dumbledore did so effortlessly, give his magic the threefold characteristics of ancient sorcery, ancient magic, and modern magic while retaining only their advantages and none of their drawbacks.
So, at least in terms of magical stability and duration, he was nowhere near Dumbledore's level.
"It's still pretty good. If there really isn't any other way, we could use this as a backup plan." Hermione thought this actually counted as a fairly good result.
Hagrid and Ron nodded too.
After chatting a little longer with Grawp, whose speech was still rather unclear, Harry