A teenager has been hospitalised after allegedly being attacked with a knife during an armed robbery.

One of those charged was on bail when the young victims were allegedly ambushed in Melbourne's south-east.

Footage shows fists flying on a quiet suburban street before the violence escalates.

One person allegedly pulls a knife from his pants cornering the 19-year-old victim on a Pakenham porch.

He tries to defend himself and is slashed on the arm but manages to get away seconds later.

Local man Norman Vellien said he was "shocked".

"We didn't expect this to happen right next door to our house," he said.

Police allege the teens pulled up next to the victim and his mate in a stolen Range Rover.

When their demands weren't met a brawl erupted outside an innocent couple's house.

The c

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