Mason listened while also looking around for the poltergeist. From what he was hearing, the real trouble maker was the child and the Ravenclaw frowned as he heard what the poltergeist had done to some of the other students.

He didn't know the people he was talking about but no one deserved to be buried with suits of armour with the swords pointed downwards or getting dropped down from a high place. ...okay he could think of a couple who did deserve it but they weren't from this school. And only to scare them, not injure.

"That all sounds aweful, thanks for warning us" he said and then grabbed his wand and took a deep concentrated breath and closed his eyes.

'You can do this, you can do this, you can do this'

He said the incantation of the shield charm and perhaps it was all the pressure behind it that was not present in classes Or apparently when Dora punched and broke his nose perhaps he had been a bit egoistic at that time thinking she wouldn't harm him...but this time he successfully casted the shield charm around him.

But for how long could he keep it up and how strong was it?

He also didn't have any firworks or dungbombs with him but he did have a wand, and defensive spells weren't his specialty but offensive ones were. "I could lift my shield charm and use periculum to shoot red firework sparks in the air" he said. If someone else covers my back while i'm defensless that is..."

He was looking at the Professor at this moment because again, he did not really trust other students with spellwork used on him if necessary.