Hezbollah will simply "call" Hamas after Israel's ground invasion starts and will ask "are you guys alright?" If Hamas says yes, Hezbollah will not join the war, but if Hamas says we need help, Hezbollah will start unloading its inventory of precision guided rockets and missiles on Israel, and Israel is expecting it, thats why it is clearing many settlements in north Israel now. We will never know how many IDF soldiers die in airbases and secret bases attacks by Hezbollah and Hamas (like in 2021 battle against Israel).