Booming Blade and Combat Manoeuvres Question

[Volund]

Here is the Sage Advice link: http://dnd.wizards.com/articles/features/rules-answers-april-2016

"First, each of these spells involves a normal melee weapon attack, not a spell attack, so you use whatever ability modifier you normally use with the weapon. (A spell tells you if it includes a spell attack, and neither of these spells do.) For example, if you use a longsword with green-flame blade, you use your Strength modifier for the weapon’s attack and damage rolls.

Second, neither green-flame blade nor booming blade works with Extra Attack or any other feature that requires the Attack action. Like other spells, these cantrips require the Cast a Spell action, not the Attack action, and they can’t be used to make an opportunity attack, unless a special feature allows you to do so.

Third, these weapon attacks work with Sneak Attack if they fulfill the normal requirements for that feature. For example, if you have the Sneak Attack feature and cast green-flame blade with a finesse weapon, you can deal Sneak Attack damage to the target of the weapon attack if you have advantage on the attack roll and hit."

 

[Paul Farquhar]

That's what I was thinking of. I wasn't entirely correct, but it implies that Trip (etc) does not work (requires an attack action), an Riposte would not normally work (can’t be used to make an opportunity attack, unless a special feature allows you to do so) - somewhat debatable. Feinting Attack does work.

 

[StormbringerAUS]

Thanks for all the comments, I appreciate your time.

Firstly I did understand riposte would not work as needed a reaction, this was just for a reaction in other circumstances.
I was just looking for one that might work with Booming Blade. The idea with the Hexblade's Curse a critical on a 19 or 20 and double damage dice from the weapon, Booming Blade and maybe trip possibly even Hex for one big hit of Nova damage even at first level.

The discussion highlights what thoughts I had and why I couldn't decide. I will show these comments to the DM and he will make final decision.

The different explanations

 

[Harzel]

That's what I was thinking of. I wasn't entirely correct, but it implies that Trip (etc) does not work (requires an attack action), an Riposte would not normally work (can’t be used to make an opportunity attack, unless a special feature allows you to do so) - somewhat debatable. Feinting Attack does work.

Trip Attack

When you hit a creature with a weapon attack, you can expend one superiority die to attempt to knock the target down. You add the superiority die to the attack’s damage roll, and if the target is Large or smaller, it must make a Strength saving throw. On a failed save, you knock the target prone.

What makes you think that Trip requires the Attack action?

 

[cooperjer]

Booming blade and trip seem to be a great combination.

 

[jaelis]

For reference, here's all the PHB manuevers and whether they work with BB/GFB or not:

Commanding Strike: NO (requires attack action)
Disarming Attack: YES
Distracting Strike: YES
Evasive Footwork: NO (works on a move)
Feinting Attack: NO (requires a bonus action)
Goading Attack: YES
Lunging Attack: YES
Maneuvering Attack: YES
Menacing Attack: YES
Parry: NO (used when you are hit)
Precision Attack: YES
Pushing Attack: YES (But the push would not trigger BB damage)
Rally: NO (Requires a bonus action)
Riposte: NO (used when you are attacked)
Sweeping Attack: YES
Trip Attack: YES (Does standing up trigger BB damage?)

 

[Satyrn]

Trip Attack: YES (Does standing up trigger BB damage?)

I'd probably rule yes.