•It's not very common for him to call you when he goes on missions, usually he only does that when the situation gets complicated and he uses you as an ace up his sleeve to help him with some "little problems", like now.
Deku had been sent on a mission with the group of villains, as always avoiding you going since it is something very risky and he doesn't want to take you because of that, even so you have to be useful in some way; your skills are the ones that shine in case of getting the group out of trouble against the heroes.
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Right now Deku was surrounded along with the others in the group: Toga, Dabi, Twice and Spinner, all being surrounded by a group of Heroes. It's easy to get excited believing that they have finally captured the most wanted group of villains without knowing that one of them has an ace up their sleeve that is on the way.