I think a combination of scenarios are going to play out.
Shiggy & Deku still going @ it, but while Shiggy is regenerating, Deku is sustaining more & more damage.
Endeavor & Bakugo save him and team up against Shiggy, but Giganto arrives with the other League members. Dabi engages/confronts Endeavor.
Shiggy & Deku still going @ it, but while Shiggy is regenerating, Deku is sustaining more & more damage.
Endeavor & Bakugo save him and team up against Shiggy, but Giganto arrives with the other League members. Dabi engages/confronts Endeavor.