Al, before he even really has time to think and thus acting on pure instinct, dives for the little fluff-ball creature, curling his body around them defensively to shield them from the spider-thing, and consequently from the several fireballs and boulders that were lobbed at the spider-thing. Depending on how much of a burst radius those all have, he might be fine or might be quite singed and/or bruised.
Once the barrage of attacks is over, he'll look over to the where the spider-thing is now discorporating. There's a pang of guilt in his chest. That was probably a digimon, and thus probably at least had the potential be a person, maybe even a friend.
He has no idea how one is supposed to try and befriend someone who is trying to eat you, but a carefully protected part of him refuses to believe it's impossible.
Nonetheless, a larger and more practical part of himself recognizes that, in the finitude of his competence, there wasn't really anything he could have done, and the creature he's currently shield isn't deserving of any less care than the one who was chasing them.
He sighs, and uncurls a bit, before looking down at the fluff-ball and asking, "Are you alright?"