The Dink Network

I've been trying to fix this for ages. I swear someone gave me the answer a while ago, but I've forgotten it and been working on other parts of FoD instead, so here's my question.

In the first Boss Battle, Dink fights an enlarged slime but the slime's hardness box remains fixed to that of a regular slime. I've checked the DinkC Reference book with no luck in sorting the problem, because the solution it mentions involved load_sequence_now codes that I haven't got in the script.
How can I fix this?

The slime spawns in place of another sprite (morphing, according to the storyline).

	playsound(24, 22052, 0, 0, 0);
	&explo = create_sprite(363, 192, 7, 167, 1);
	sp_seq(&explo, 167);
	sp_seq(&current_sprite, 691);
	sp_frame(&current_sprite, 1);
	sp_size(&current_sprite, 360);

Is there some way to set the combat sprite's hardness box by modifying the create_sprite section? Or do I need to do something else?