^ Oh, that's right. An extremely weakened BASE Trunks blocked one of Broly's ki blasts. Thanks for reminding me. 😛
In all seriousness, I'm pretty sure Broly launched three additional ki blasts immediately after that one failed. Were they all blocked by Trunks' one defensive energy sphere? Was never really sure on that one. Either way, when Goku/Gohan/Goten all worked together, they overpowered Broly's blast easily--completely shattered it, iirc.